Terms starting with T.

'thousand cuts' strategy

The 'thousand cuts' strategy is Pakistan's long-standing doctrine of bleeding India through a thousand small wounds rather than open war, articulated by General Zia-ul-Haq in the 1980s. It uses proxy terrorism, insurgency support and subversion to impose continuous security and economic costs. It matters because it explains the pattern behind Kashmir militancy, the Khalistan revival attempts and cross-border narco-terrorism.

Example: Zia-ul-Haq's doctrine of bleeding India through proxy war

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“The supreme art of war is to subdue the enemy without fighting”

The supreme art of war is to subdue the enemy without fighting is a maxim from Sun Tzu's The Art of War, the ancient Chinese treatise on strategy, arguing that the highest victory is won through understanding, deterrence and moral force rather than battle. It is the essayist's gateway to soft power, diplomacy, reconciliation and non-violence. It was a UPSC 2025 essay topic.

Example: UPSC 2025 essay paper: The supreme art of war is to subdue the enemy without fighting, from Sun Tzu's The Art of War.

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“The years teach much which the days never know”

The years teach much which the days never know is a line attributed to the American essayist Ralph Waldo Emerson, contrasting the shallow lessons of daily experience with the deep wisdom that only long time confers. It argues for patience, perspective and institutional memory over urgency and instant judgment. It was a UPSC 2025 essay topic.

Example: UPSC 2025 essay paper: The years teach much which the days never know, attributed to Ralph Waldo Emerson.

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T-cells

T-cells are a type of white blood cell, or lymphocyte, that are central to the adaptive immune response. They mature in the thymus and include helper T-cells that coordinate immunity and cytotoxic T-cells that kill infected or cancerous cells. Engineered T-cells are the basis of modern immunotherapies such as CAR-T cell therapy for blood cancers.

Example: CAR-T therapy engineers a patient's own T-cells to recognise and destroy cancer cells.

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T. Haque

T. Haque is the agricultural economist who chaired the NITI Aayog expert committee on land leasing (2016), recommending legalisation of tenancy with ownership safeguards. His model act proposed written leases, fixed terms and no adverse possession for tenants. For UPSC he is the authority behind the model land-leasing law.

Example: States amending tenancy laws cite the Haque committee's safeguards for landowners.

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T. N. Seshan

T. N. Seshan is Tirunellai Narayana Iyer Seshan, Chief Election Commissioner of India from 1990 to 1996. He transformed the Election Commission into an assertive institution, strictly enforcing the Model Code of Conduct, curbing booth capturing and electoral malpractices, and introducing voter identity cards. For UPSC, he is the defining figure of electoral reforms in GS-2 polity, embodying how institutional leadership can strengthen the credibility of Indian democracy.

Example: Chief Election Commissioner, 1990-1996

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T.K. Madhavan

T.K. Madhavan is Deshabhimani T.K. Madhavan (1885-1930), the Kerala social reformer who led the Vaikom Satyagraha of 1924-25 against untouchability and for temple-entry rights. He also founded the newspaper Deshabhimani to spread reformist ideas. For UPSC, he is a key figure in GS-1 modern India, linking temple-entry movements, the Sree Narayana reform tradition, and Gandhi's engagement with caste discrimination.

Example: Vaikom Satyagraha, 1924-25

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T.N. Godavarman judgment

The T.N. Godavarman v. Union of India judgment of December 1996 is the Supreme Court ruling that forest must be understood in its dictionary meaning, bringing all forest-like lands under the Forest (Conservation) Act.

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T.N. Godavarman judgment of December 1996

The T.N. Godavarman judgment of 12 December 1996 is the Supreme Court's landmark ruling on forest conservation. It gave the word forest its dictionary meaning regardless of ownership or classification, ordered states to identify all forest areas through expert committees, restricted tree felling, and placed continuing mandamus over forest matters, becoming the foundation of India's forest jurisprudence.

Example: After the judgment, states had to set up expert committees to identify forests, including unclassified and degraded forest lands.

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Tabaqat-i-Nasiri

Tabaqat-i-Nasiri is the Persian chronicle of Minhaj-i Siraj Juzjani, completed around 1260 CE and dedicated to Sultan Nasiruddin Mahmud of Delhi. It is the earliest major history of the Delhi Sultanate, covering the Ghurid conquests and the early sultans in 23 volumes. For UPSC, it is the foundational Persian source for the Sultanate period in GS-1 medieval history, frequently cited for the reigns from Qutbuddin Aibak onward.

Example: Minhaj-i Siraj, c. 1260

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tabla, sitar, sarangi, santoor, flute

These are principal instruments of Hindustani classical music: the tabla (paired hand drums), sitar and sarangi (plucked and bowed strings), santoor (hammered dulcimer) and the bansuri flute. Together they anchor solo performance and jugalbandi ensembles in the North Indian tradition. UPSC: GS-1 art and culture, performing arts.

Example: Sitar maestro Ravi Shankar (1920-2012).

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tabligh and tanzim

Tabligh (propagation) and tanzim (organisation) were Muslim communal consolidation drives of the 1920s aimed at religious reform and community defence, emerging partly as a response to the Arya Samaj's shuddhi and sangathan campaigns after the Khilafat-Non-Cooperation collapse. The Tablighi Jamaat grew out of this milieu. UPSC: GS-1 communalism and the national movement.

Example: Muhammad Ilyas founded the Tablighi Jamaat in the Mewat region in 1926.

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TADA

The Terrorist and Disruptive Activities (Prevention) Act, 1985, known as TADA, was India's first dedicated anti-terror law, with stringent bail and confession provisions. It lapsed in 1995 amid criticism of misuse. It matters as the legislative ancestor of POTA and UAPA, and a cautionary tale on balancing security with liberties.

Example: TADA prosecutions during the Punjab militancy

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TAF

TAF is the Technology Adoption Fund, a Rs 500-crore fund launched by IN-SPACe in 2025 to help Indian space startups and MSMEs turn early-stage technologies into commercially viable products. It funds up to 60 percent of project costs for startups and MSMEs (40 percent for larger firms), capped at Rs 25 crore per project, targeting import substitution. For UPSC, it is a current-affairs example of private-sector space reforms and Atmanirbhar Bharat in GS-3 science and technology.

Example: IN-SPACe launch, 2025

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Tagore

Tagore is Rabindranath Tagore (1861-1941), the Bengali poet, philosopher, and educationist who won the 1913 Nobel Prize in Literature for Gitanjali, becoming the first non-European laureate. He composed India's national anthem Jana Gana Mana, founded Visva-Bharati at Santiniketan, and renounced his knighthood after the 1919 Jallianwala Bagh massacre. For UPSC, he spans GS-1 art, culture, and the national movement, and GS-4 ethics on universal humanism.

Example: Nobel Prize in Literature, 1913

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Tailapa II

Tailapa II was the founder of the Western (Kalyani) Chalukya dynasty, who overthrew the Rashtrakutas around 973 CE and restored Chalukya power in the Deccan. His reign reunited the Karnataka region under one authority, revived temple patronage and court culture, and set the stage for two centuries of Chalukya rivalry with the Cholas. For UPSC, he marks the post-Rashtrakuta transition in Deccan political history.

Example: His defeat of the Rashtrakuta king Karka II and seizure of the Deccan throne around 973 CE, founding the Kalyani Chalukya line.

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Taittiriya Brahmana

Taittiriya Brahmana is a Vedic prose text belonging to the Krishna Yajurveda, containing ritual explanations, mantras, and mythological narratives for sacrifices. It preserves the earliest version of the Nachiketa story, later expanded in the Katha Upanishad, and details of Vedic cosmology. For UPSC, it is part of the GS-1 ancient-history Vedic literature corpus, illustrating the transition from ritual Brahmanas to philosophical Upanishads.

Example: Nachiketa narrative (source for Katha Upanishad)

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Taj Mahal

Taj Mahal is the ivory-white marble mausoleum at Agra built by Mughal emperor Shah Jahan between 1632 and 1653 in memory of his wife Mumtaz Mahal. Designed by Ustad Ahmad Lahori, it blends Persian, Islamic, and Indian styles with pietra dura inlay work and perfect symmetry, and was listed as a UNESCO World Heritage Site in 1983. For UPSC, it is the signature monument of Mughal architecture in GS-1 art and culture.

Example: UNESCO World Heritage Site, 1983

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Takkolam

Takkolam is the site of the Battle of Takkolam (948-949 CE) in present-day Tamil Nadu, where Rashtrakuta king Krishna III defeated the Chola crown prince Rajaditya, son of Parantaka I, who died on the field. The Rashtrakuta victory checked Chola expansion and led to the temporary loss of Tondaimandalam. For UPSC, it is a classic prelims battle question in GS-1 medieval history on Chola-Rashtrakuta rivalry.

Example: Battle of Takkolam, 948-949 CE

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Takshashila

Takshashila, also called Taxila, is the Gandhara centre of learning flourishing from about the sixth century BCE to the fifth century CE, where independent teachers drew students for medicine, law, grammar, statecraft and archery. It matters as the guild model of the ancient university, set against Nalanda's single endowed campus.

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tala

Tala is the cyclical rhythmic framework of Indian classical music, a fixed cycle of beats called matras with stressed and unstressed points marked by hand gestures. It structures every raga performance alongside melody and is shared, with variations, by Hindustani and Carnatic traditions. UPSC: GS-1 art and culture, music.

Example: Teental, the sixteen-beat tala most common in Hindustani music.

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Talatal Ghar and Kareng Ghar

Talatal Ghar and Kareng Ghar is the seven-storied Rangpur Palace of the Ahom kings at Rangpur near Sivasagar, Assam. Kareng Ghar comprises the four above-ground floors built under Rudra Singha, while Talatal Ghar is the three underground floors added by Rajeswar Singha, serving as a military base with two secret tunnels. For UPSC, it exemplifies Ahom architecture and Assam's medieval polity in GS-1 art, culture, and history.

Example: Rangpur Palace, Sivasagar, Assam

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Talcher (Odisha)

Talcher is a town in Angul district, Odisha, famous for one of India's oldest and largest coalfields, mined since the 1920s. It hosts major coal-based thermal power capacity, including NTPC's Talcher Super Thermal Power Station, making it central to eastern India's energy map. For UPSC, Talcher is a go-to example in GS-1 and GS-3 for coal resources, energy geography, and the environmental costs of coal mining.

Example: Talcher coalfield, Angul district, Odisha

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talens

TALENs (transcription activator-like effector nucleases) are gene-editing tools built from engineered proteins that read DNA one base at a time, fused to a cutting enzyme. They are more flexible than ZFNs but bulkier to construct.

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Taliban

The Taliban is a Sunni Islamist fundamentalist movement founded in 1994 in Kandahar by Mullah Mohammad Omar, drawn from religious students (taliban means students). It ruled Afghanistan from 1996 to 2001, imposing a strict interpretation of Sharia, sheltered al-Qaeda, was ousted after the 9/11 attacks, and returned to power in August 2021 after the US withdrawal. For UPSC, it shapes India's Afghanistan policy, regional security, and counterterrorism concerns.

Example: The recapture of Kabul in August 2021 following the US withdrawal under the 2020 Doha Agreement.

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Talikota

Talikota is the Battle of Talikota, fought on 23 January 1565 on the banks of the Krishna river, where an alliance of the Deccan Sultanates (Ahmadnagar, Bijapur, Golconda, and Bidar) decisively defeated Vijayanagara under Aliya Rama Raya. The Vijayanagara capital was sacked and the empire shattered. For UPSC, it is the watershed event of GS-1 medieval history marking the decline of the last great Hindu empire of the south.

Example: 23 January 1565

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Talikota (Rakshasa-Tangadi)

Talikota (Rakshasa-Tangadi) is the full name of the Battle of Talikota of 1565, fought at the villages of Rakshasa and Tangadi on the Krishna river, where the allied Deccan Sultanates crushed Vijayanagara under Aliya Rama Raya. Rama Raya was captured and executed, and the capital city was plundered. For UPSC, knowing the alternative name Rakshasa-Tangadi helps in prelims, where the battle is often asked by its battlefield name.

Example: Battle of Talikota, 23 January 1565

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Talisman test is

The Talisman test is Mahatma Gandhi's ethical touchstone for decision-making: whenever in doubt, recall the face of the poorest and weakest person you have seen, and ask whether the contemplated step will be of any use to them. It converts abstract policy into a human-impact check, placing the last person first. For UPSC, it is a staple of GS-4 ethics answers on compassion, empathy and pro-poor governance.

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Tallinn Manual 2.0

Tallinn Manual 2.0 is the 2017 academic restatement of how international law applies to cyber operations, prepared by experts at NATO's cyber defence centre. Though not binding, it is the most cited reference on cyber warfare law. It matters for debates on when a cyberattack amounts to use of force.

Example: The expert manual on international law and cyber operations

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Tamasha

Tamasha is the traditional folk theatre of Maharashtra, combining dance, music, comedy, and drama in open-air performances. Lavani songs, the dholki drum, and witty dialogues by the sutradhar are its hallmarks, and it has historically carried social satire to rural audiences. For UPSC, it is a staple GS-1 art-and-culture example of Maharashtra's folk traditions alongside Powada and Bharud.

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Tamil

Tamil is a Dravidian language spoken by over 70 million people, the official language of Tamil Nadu and Puducherry and an official language of Sri Lanka and Singapore. One of the world's oldest living classical languages, it was the first to be declared a classical language of India in 2004, with a rich Sangam literature. For UPSC, it features in GS-1 language policy, the Eighth Schedule, and classical-language questions.

Example: declared a classical language, 2004

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Tamil country

Tamil country is Tamilakam, the ancient Tamil-speaking land of the far south comprising the Chera, Chola, and Pandya kingdoms during the Sangam age (roughly 300 BCE to 300 CE). Celebrated in Sangam literature, it was a land of ports, pearl fisheries, and Roman trade. For UPSC, Tamilakam is essential GS-1 ancient-history vocabulary for South Indian polity, society, and Indo-Roman trade before the Pallavas.

Example: Sangam-age Chera, Chola, Pandya kingdoms

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Tamil Nadu

Tamil Nadu is the southern Indian state with Chennai as its capital, formed as Madras State in 1950 and renamed in 1969. Shaped by the Dravidian movement, it is known for welfare schemes like the noon-meal programme, strong industrial growth and high social indicators. It features in federalism, language and social policy debates. Example: the pioneering noon-meal scheme later adopted across India.

Example: the pioneering noon-meal scheme later adopted across India

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Tamil Nadu Blockchain Backbone

Tamil Nadu Blockchain Backbone is the state's blockchain-as-a-service infrastructure, branded Nambikkai Inaiyam (meaning trusted link), launched by TNeGA in June 2023 with the e-Pettagam citizen wallet app. It secures e-Sevai certificates, academic records, and land transaction data against tampering through blockchain verification. For UPSC, it is a GS-2/GS-3 e-governance case study on using emerging technology for trustworthy digital public infrastructure.

Example: Nambikkai Inaiyam, launched June 2023

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Tamil Nadu erupted in anti-Hindi agitations

Anti-Hindi agitations in Tamil Nadu is the series of protests in 1937-40 and 1965 against the imposition of Hindi, first against compulsory Hindi in schools under C. Rajagopalachari and later against making Hindi the sole official language under the Official Languages Act of 1963. The 1965 agitation forced the Centre to retain English indefinitely. For UPSC, it is the landmark GS-2 case of language federalism and Centre-state relations.

Example: 1965 anti-Hindi agitation, Tamil Nadu

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Tamil poet-saints

Tamil poet-saints is the collective term for the Alvars and Nayanars, the Vaishnavite and Shaivite bhakti saints of Tamil Nadu who flourished between the 6th and 9th centuries CE. Composing devotional hymns in Tamil like the Divya Prabandham and Tevaram, they democratized religion beyond Sanskrit ritualism. For UPSC, they anchor GS-1 medieval culture and the bhakti movement, bridging south Indian temple traditions and pan-Indian devotionalism.

Example: Divya Prabandham and Tevaram hymns

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Tamluk (Bengal)

Tamluk is the modern town in West Bengal identified with ancient Tamralipta, a famed port of eastern India mentioned by Ptolemy and Chinese travellers, which traded with Southeast Asia. In 1942 it became the seat of the Tamralipta Jatiya Sarkar, a parallel national government during the Quit India Movement. For UPSC, it links GS-1 ancient maritime trade and the 1942 parallel governments at Tamluk, Ballia, and Satara.

Example: Tamralipta Jatiya Sarkar, December 1942

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Tamluk on 29 September 1942

Tamluk on 29 September 1942 is the date of Matangini Hazra's martyrdom during the Quit India Movement. The 71-year-old Gandhian, fondly called Gandhi Buri, led a procession to capture the Tamluk police station and was shot dead by police while holding the Congress flag aloft and chanting Vande Mataram. For UPSC, she is an iconic GS-1 example of women's participation in the freedom struggle and of 1942's militant mass phase.

Example: Matangini Hazra's martyrdom, 29 September 1942

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Tana Bhagat movement (1914-15)

Tana Bhagat movement is the tribal reform and resistance movement launched in 1914 among the Oraon tribe of Chotanagpur (present Jharkhand) by Jatra Bhagat. Blending religious revival with opposition to British taxes, begar, and zamindari exploitation, its followers adopted Gandhian non-violence and later joined the Congress. For UPSC, it is a textbook GS-1 tribal movement linking religious reform, agrarian grievance, and the national movement.

Example: Jatra Bhagat, Chotanagpur, 1914

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Tandava

Tandava is the cosmic dance of Lord Shiva, most famously embodied in the Nataraja bronze icons of the Chola period. Its rhythmic movements symbolize the cosmic cycles of creation, preservation, and destruction, with the damru (creation), fire (destruction), and the dwarf of ignorance underfoot. For UPSC, it is core GS-1 art-and-culture vocabulary, illustrating how Hindu philosophy was expressed through dance and sculpture.

Example: Nataraja bronzes of the Chola period

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Tanjore and Mysore schools

The Tanjore and Mysore schools are two classical South Indian painting traditions rooted in Vijayanagara and Nayaka patronage. Tanjore painting, which peaked under the Maratha ruler Serfoji II, is known for rich colours, gold foil and glass inlay on wooden panels depicting deities. Mysore painting, nurtured by the Wodeyars, uses subtler hues and the gesso technique. Both hold GI tags and matter for UPSC art-and-culture questions.

Example: Serfoji II's patronage of Tanjore painting (early 19th century)

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tanks, poison gas, aircraft, submarines and barbed wire

These were the novel weapons of the First World War: tanks, poison gas, military aircraft, submarines and barbed wire turned 1914-18 into the first industrialised total war, producing casualties on an unprecedented scale. They mark the entry of science and industry into mass warfare. UPSC: GS-1 world history.

Example: Tanks were first used in battle at the Somme in September 1916.

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Tansen

Tansen is the court title of Ramtanu Pandey, the legendary Hindustani musician counted among the Navaratnas of Akbar's court. A master of Dhrupad, he is credited with creating ragas such as Mian ki Todi, Mian ki Malhar and Darbari Kanada, and with systematizing Hindustani music theory. For UPSC, he anchors art-and-culture questions on Mughal court music and the Bhakti-era musical tradition.

Example: Mian ki Malhar (raga attributed to Tansen)

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TAPI

TAPI is the Turkmenistan-Afghanistan-Pakistan-India natural gas pipeline, designed to carry gas from Turkmenistan's Galkynysh field to Fazilka in Punjab, India. Conceived to diversify India's energy imports and anchor regional cooperation, it has been repeatedly delayed by security and financing concerns in Afghanistan and Pakistan. For UPSC it is the flagship example of energy diplomacy and cross-border infrastructure.

Example: The 2015 groundbreaking of the Turkmen section of the pipeline at Mary in Turkmenistan.

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Tappa

Tappa is a semi-classical Hindustani vocal form marked by quick, jerky taans, playful lyrics and a lively rhythm, sung in a light classical style. It originated among the camel riders of Punjab and was refined in the late 18th century by Shori Miyan at the Awadh court. For UPSC, it illustrates the regional and folk roots of Hindustani music and the Awadh contribution to art and culture.

Example: Shori Miyan (who refined tappa in 18th-century Awadh)

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taqavi

Taqavi (taccavi) loans were state advances given to peasants for seeds, cattle and implements, recoverable along with land revenue. Granted under the Sultanate and Mughal administrations and continued by the British, they were an early form of state-sponsored agricultural credit in India. UPSC: GS-1 medieval economic history and GS-3 agricultural finance.

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Tarabai

Tarabai is the Maratha queen who served as regent from 1700 to 1708 after the death of her husband Rajaram, ruling in the name of her minor son Shivaji II. She sustained Maratha resistance against Aurangzeb through guerrilla warfare and later founded the Kolhapur branch of the Maratha house. For UPSC, she is a key example of women's political leadership in medieval Indian history and Maratha polity.

Example: Kolhapur (the Maratha branch she founded)

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Tarana

Tarana is a Hindustani vocal composition built on rhythmic, Persian-derived syllables such as na, dir, dani and tom, sung at a fast tempo with intricate taans. Its invention is credited to Amir Khusrau in the 13th-14th century, and it became a staple of khayal performance. For UPSC, it features in art-and-culture questions on Hindustani music forms and Khusrau's cultural legacy.

Example: Amir Khusrau (credited with inventing the tarana)

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tarangam

Tarangam is a Kuchipudi dance sequence in which the dancer performs on the rim of a brass plate, often balancing a pot of water on the head, while enacting episodes from Krishna's life. It is the signature virtuoso item of the Kuchipudi repertoire and tests balance, rhythm and abhinaya together. UPSC: GS-1 art and culture, classical dance.

Example: The form is traditionally credited to Siddhendra Yogi, the 15th-century systematiser of Kuchipudi.

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Target

In UPSC-context usage, 'target' denotes a quantified policy goal set by the government, such as a fiscal deficit target, an inflation target or a Sustainable Development Goal target. Targets provide benchmarks for planning, budgeting and accountability, and their achievement or shortfall is frequently examined. For UPSC, the term appears across economy and governance answers wherever policy performance is assessed.

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Target 3

Target 3 of the Kunming-Montreal Global Biodiversity Framework is the commitment to ensure that by 2030 at least 30 percent of terrestrial, inland water, and coastal and marine areas are effectively conserved and managed. Popularly called the 30x30 target, it is the headline conservation goal of the post-2020 global biodiversity framework adopted at COP15 in 2022.

Example: India's expanding network of protected areas and community reserves contributes to the 30x30 target.

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Target Olympic Podium Scheme (TOPS)

The Target Olympic Podium Scheme (TOPS), launched in 2014, funds elite athletes' training, foreign exposure and support staff for Olympic and Paralympic medal prospects. It backs stars like P. V. Sindhu and Mary Kom. It is the essay's elite-tier complement to Khelo India's grassroots base.

Example: TOPS funding of India's Olympic medal prospects since 2014.

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Target pressure

Target pressure is the strain officials face when given unrealistic or rigid performance targets, which can push them toward data manipulation, exclusion of difficult cases and other unethical shortcuts. It is a recognized cause of institutional misconduct in administrative ethics. For UPSC GS-4, it is used to explain how target-driven cultures erode integrity, as in the Wells Fargo fake-accounts scandal of 2016.

Example: Wells Fargo fake-accounts scandal (2016, driven by aggressive sales targets)

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Targeted PDS (TPDS)

The Targeted PDS is the 1997 system that divided ration-card holders into Below Poverty Line and Above Poverty Line categories with different issue prices. It cut the food-subsidy bill but created large exclusion errors in BPL identification. For UPSC it is the defining reform that made targeting, for better or worse, the PDS's operating principle.

Example: A BPL family receiving grain at Re 1 per kg while APL families paid more was the TPDS design.

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Targeted Public Distribution System (TPDS)

The Targeted Public Distribution System is the formal name of the 1997 regime that replaced universal PDS with BPL and APL categories at differentiated prices. It aimed to concentrate subsidies on the poor but suffered from faulty BPL lists and dealer-level diversion. For UPSC it is the system the NFSA later reformed into priority and Antyodaya categories.

Example: The TPDS's BPL lists, drawn from decade-old surveys, became the classic case of targeting errors.

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targeting failures

Targeting failures are inclusion and exclusion errors in welfare delivery: benefits reaching the non-poor (inclusion error) while missing the genuinely poor (exclusion error). They are central to debates on universal versus targeted schemes and on the use of technology like Aadhaar to plug leakages. UPSC: GS-2 welfare schemes and governance.

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tariffication

Tariffication is the Uruguay Round process of converting farm import quotas, bans and other non-tariff barriers into equivalent bound tariffs. It made protection transparent and negotiable, though the resulting tariffs could be very high. For UPSC it is the technical term for how farm trade was brought under tariff discipline.

Example: India's conversion of quantitative restrictions on farm imports into tariffs in the 1990s was tariffication in practice.

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Tarikh-i-Firuz Shahi

Tarikh-i-Firuz Shahi is a Persian chronicle of the Delhi Sultanate written by Ziauddin Barani, covering the period from Balban to Firuz Shah Tughlaq in the 14th century. It is a principal source on Tughlaq administration, Alauddin Khalji's market reforms and the political theory of the Sultanate. For UPSC, it is a standard source-based question in medieval Indian history and historiography.

Example: Ziauddin Barani (author of the chronicle)

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Tarique Rahman

Tarique Rahman is a Bangladeshi politician and the acting chairman of the Bangladesh Nationalist Party (BNP), the son of former president Ziaur Rahman and former prime minister Khaleda Zia. He lived in exile in London from 2008 and returned to Bangladesh in December 2025 after the fall of the Hasina government. For UPSC, he matters for India-Bangladesh relations and questions on neighbourhood political transitions.

Example: Bangladesh Nationalist Party (BNP, the party he leads)

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Tarkunde Committee

The Tarkunde Committee (1974), a citizens' committee on electoral reforms under jurist V.M. Tarkunde constituted during the JP movement, recommended a multi-member Election Commission, curbs on money and muscle power, and state funding of elections. Though unofficial, its proposals shaped the reform agenda for decades.

Example: its demand for a multi-member Election Commission was realised in 1993

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Tarna Nayak and Dharni Dhar Nayak

The names point to Nayak figures from Odisha's tribal history, but the extraction is a fragment and publicly traceable records do not firmly establish who Tarna Nayak and Dharni Dhar Nayak were or which uprising they joined. It likely comes from an account of a 19th-century tribal resistance in Odisha. For UPSC, treat it as a reminder that many tribal leaders remain under-documented in standard sources.

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TAS (Tension-Antithesis-Synthesis)

TAS (Tension-Antithesis-Synthesis) is the essay bank's core architecture: open with a tension between two truths, stage the antithesis that challenges the first view, and close with a synthesis that holds both. It prevents one-sided essays by building the counter-argument into the structure. It is the master move the bank rehearses across every sub-theme.

Example: The essay bank's TAS architecture for turning a topic's hidden tension into a full argument.

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Tasawwuf

Tasawwuf is the Arabic term for Islamic mysticism, known in English as Sufism: the inward, devotional path seeking direct experience of God through love, asceticism and spiritual discipline. Organized into orders (silsilas) such as the Chishti and Suhrawardi, it shaped shrines, qawwali and syncretic culture in India. For UPSC, it is central to medieval religious movements and Bhakti-Sufi questions.

Example: Khwaja Muinuddin Chishti (Chishti saint of Ajmer)

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Tashkent Agreement on 10 January 1966

The Tashkent Agreement is the peace settlement signed on 10 January 1966 at Tashkent between India's Lal Bahadur Shastri and Pakistan's Ayub Khan, ending the 1965 Indo-Pak war. Mediated by Soviet premier Alexei Kosygin, it required both sides to withdraw to pre-war positions. For UPSC, it is a landmark in India's foreign policy and post-Nehru diplomacy, remembered also for Shastri's death hours after signing.

Example: Lal Bahadur Shastri (died at Tashkent on 11 January 1966)

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Tashkent in October 1920

The phrase refers to the founding of the Communist Party of India at Tashkent in October 1920 by M. N. Roy and fellow Indian revolutionaries, with support from the Communist International. Formed in exile, it predates the party's formal organization at Kanpur in 1925. For UPSC, it marks the origin of the communist movement in India and appears in modern-history questions on revolutionary and left politics.

Example: M. N. Roy (founder of the Tashkent group)

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tasvir-khana

The tasvir-khana was the Mughal imperial painting atelier, a state karkhana where master artists and apprentices produced illustrated manuscripts under court supervision. Akbar's atelier systematised Persian and Indian styles and professionalised miniature painting in India. UPSC: GS-1 medieval art and culture.

Example: Akbar's tasvir-khana, described in Abul Fazl's Ain-i-Akbari (1590s).

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Tata Electronics

Tata Electronics is the Tata group's electronics manufacturing arm. It is building India's first semiconductor fabrication plant at Dholera, Gujarat, in partnership with Taiwan's PSMC at an investment of about 91,000 crore rupees for mature nodes from 28nm to 90nm, alongside an outsourced semiconductor assembly and test (OSAT) facility in Assam worth about 27,000 crore rupees, under the India Semiconductor Mission.

Example: Intel signed an MoU with Tata Electronics to explore manufacturing chips at its upcoming Dholera fab.

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Tata Institute of Fundamental Research (TIFR)

The Tata Institute of Fundamental Research is a premier public research institution in Mumbai, founded in 1945 by Homi J. Bhabha under the Department of Atomic Energy. It conducts fundamental research in physics, mathematics, chemistry, biology and computer science, and contributes to India's quantum computing efforts under the National Quantum Mission.

Example: TIFR is among the institutions developing indigenous superconducting quantum computers under the National Quantum Mission.

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Tata Memorial Hospital

Tata Memorial Hospital in Mumbai, founded in 1941 and now under the Department of Atomic Energy, is India's premier cancer treatment and research centre. It provides affordable cancer care to lakhs of patients, runs the Advanced Centre for Treatment, Research and Education in Cancer, and maintains one of the country's most important cancer registries.

Example: Its hospital-based cancer registry is a key source of data on cancer trends in India.

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Tata Semiconductor Assembly and Test

Tata Semiconductor Assembly and Test Pvt Ltd is setting up India's first indigenous greenfield outsourced semiconductor assembly, test and packaging (OSAT) facility at Jagiroad in Morigaon district, Assam, on the former Nagaon paper mill site, with an outlay of about Rs 27,000 crore and a planned capacity of 48 million packaged chips per day. Cleared under the India Semiconductor Mission in 2024, it uses wire-bond, flip-chip and integrated system packaging technologies and is expected to generate around 27,000 direct and indirect jobs.

Example: Trial production began in September 2026, with commercial operations expected by December 2026 or January 2027.

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Tattvartha Sutra

The Tattvartha Sutra is the foundational Jain philosophical text composed by Umaswati (also called Umasvami), dated roughly to the early centuries CE. Written in Sanskrit and accepted by both Digambara and Shvetambara traditions, its ten chapters systematize Jain metaphysics around the tattvas, the fundamental realities. For UPSC, it is a key art-and-culture reference for Jain philosophy alongside the Agamas.

Example: Umaswati (author of the text)

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tax buoyancy

Tax buoyancy is the ratio of the growth rate of tax revenue to the growth rate of GDP, measuring how responsively revenues rise with the economy without any change in tax rates. Buoyancy above one signals base expansion or improving compliance, a key fiscal health indicator. UPSC: GS-3 government budgeting and fiscal policy.

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Tax elasticity

Tax elasticity is the ratio of the percentage change in tax revenue to the percentage change in the tax base, usually GDP. An elasticity above one means revenue grows faster than the economy, while buoyancy also captures the effect of discretionary rate changes. For UPSC, it is a core economy concept used in questions on revenue forecasting, fiscal health and tax policy design.

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Tax Reforms Committee

The Tax Reforms Committee is the committee chaired by economist Raja Chelliah (1991-93) that redesigned India's tax system during the 1991 economic reforms. It recommended lower and fewer tax rates, a broader base, and the extension of MODVAT, shaping both direct and indirect tax policy. For UPSC, it is the standard reference for post-1991 tax reform and frequently appears in economy questions.

Example: Raja Chelliah (chairman of the committee)

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tax-free land grants

Tax-free land grants were revenue-free land assignments made by kings to Brahmanas, temples and officials, known in ancient India as agrahara and brahmadeya grants. They spread agrarian settlement into new regions but also fuel the scholarly debate on early Indian feudalism. UPSC: GS-1 ancient economic history.

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tax-to-GDP ratio

The tax-to-GDP ratio is total tax revenue expressed as a percentage of GDP, the standard measure of a state's fiscal capacity and tax effort. India's ratio is modest for its development level, which constrains public spending on health, education and infrastructure. UPSC: GS-3 fiscal policy and resource mobilisation.

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taxation

Taxation is the compulsory levy of money by the state on income, wealth and transactions to fund public expenditure, divided into direct taxes such as income and corporation tax and indirect taxes such as GST and customs. It is the core of fiscal policy and of Centre-state financial relations. UPSC: GS-3 economy and GS-2 federalism.

Example: The Goods and Services Tax, launched in India on 1 July 2017.

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TB Mukt Panchayat

TB Mukt Panchayat is an initiative launched by the Prime Minister on World TB Day, 24 March 2023, at Varanasi to drive tuberculosis elimination from the grassroots. It empowers panchayati raj institutions to track and address TB in their villages, with panchayats earning bronze, silver or gold certification for sustaining TB-free status for one, two or three years.

Example: A panchayat that maintains TB-free status for one year earns bronze certification under the initiative.

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Tea Act

The Tea Act is the Tea Act of 1953, the statute governing India's tea industry. It created the Tea Board as the regulator for cultivation, production, quality control and export promotion, under the Ministry of Commerce. For UPSC, it connects economy questions on plantation crops and export regulation with polity questions on statutory regulatory bodies.

Example: Tea Board of India (statutory body created under the Act)

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Tebhaga Movement (1946-47)

The Tebhaga movement was the 1946-47 peasant uprising in Bengal, led by the Kisan Sabha, demanding tebhaga: a two-thirds share of the harvest for sharecroppers (bargadars) instead of the customary half paid to jotedars. Centered in North Bengal, it was met with severe repression. For UPSC, it is a classic peasant movement of the freedom-struggle era and a precursor to later land-reform debates.

Example: All India Kisan Sabha (organizer of the movement)

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Techne

Techne is Aristotle's term for craft knowledge, the skilled know-how of making things, from carpentry to medicine. It is knowledge in the hands rather than in propositions, and the essayist uses it to defend vocational, embodied learning against purely theoretical schooling. It is the middle term between episteme and phronesis.

Example: Aristotle's concept of techne as the virtue of productive craft.

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technical and vocational training starved

This phrase captures the critique that colonial education policy starved technical and vocational training of funds, producing clerks for administration rather than engineers for industry and leaving India industrially backward at independence. It contrasts with the literary emphasis of Macaulay's system. UPSC: GS-1 modern history of education.

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Techno-legal frameworks

Techno-legal frameworks are the combination of technical standards and legal instruments that make safety enforceable: building codes, zoning regulations, safety audits and the laws backing them. They convert engineering knowledge into mandatory practice.

Example: making BIS seismic codes mandatory for new construction through municipal by-laws is a techno-legal framework

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Technological

In UPSC usage, 'technological' is the adjective describing change driven by technology: digital governance, green energy, precision agriculture and defence modernization. Answers use it to attribute economic, social and environmental shifts to innovation and adoption. For UPSC, it is a cross-cutting descriptor across GS-1, GS-2 and GS-3 wherever science and technology intersect policy.

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Technological causes

The phrase refers to technology as a causal factor in historical and economic change: industrialization, mechanization, automation and digitalization reshaping work, society and the environment. In mains answers it serves as a standard category of causation alongside economic, political and social causes. For UPSC, invoking technological causes adds analytical depth to questions on unemployment, urbanization and climate change.

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Technological convergence

Technological convergence is the fusion of AI, robotics, IoT and quantum computing into integrated systems that reshape daily life and business. It is the defining feature of IR 4.0.

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technological sovereignty

Technological sovereignty is a country's ability to develop, control, and secure the critical technologies its economy and security depend on, without being hostage to foreign suppliers or export controls. For India it means building domestic capacity in semiconductors, telecom equipment, defence systems, and digital infrastructure rather than relying entirely on imports. It is distinct from autarky: the goal is strategic autonomy and resilient supply chains, not cutting off trade.

Example: The Semicon India Programme, which supports domestic chip fabrication and assembly plants, is framed as a step toward technological sovereignty in electronics.

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technology denial

Technology denial is the refusal or restriction of technology transfer to a country through export-control regimes, used as a geopolitical lever against its strategic programmes. India faced sustained denial after 1974, which spurred indigenous development in space, missiles and nuclear energy. UPSC: GS-3 science and technology and indigenisation.

Example: The Nuclear Suppliers Group, formed in 1975 after India's 1974 Pokhran test, to restrict nuclear technology transfers.

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Technology Development Fund (TDF)

The Technology Development Fund is DRDO's scheme funding industry and academia to develop defence technologies up to prototype stage. It matters because it de-risks R&D for private firms entering defence.

Example: TDF grants for indigenous aero-engine components

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technology mission

A technology mission is the Indian policy instrument that pursues a sharp, time-bound goal in a sector through coordinated research, extension and industry action. In agriculture, missions on oilseeds, cotton and horticulture bundled technology, inputs and markets into one campaign. For UPSC, technology missions are the mission-mode template of agricultural development.

Example: The Technology Mission on Oilseeds, launched in 1986, showed how a mission could lift an entire crop sector.

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Technology Mission on Cotton

The Technology Mission on Cotton is the 2000 mission to raise cotton productivity and fibre quality through better seeds, agronomy and ginning modernisation. Its mini-missions covered research, extension, marketing and ginning, and it coincided with the Bt-cotton revolution. For UPSC it is the sectoral mission behind India's rise as a top cotton producer.

Example: Its push for improved long-staple varieties lifted both yields and export competitiveness.

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Technology Missions

The Technology Missions were six mission-mode programmes launched in 1985-86 under Rajiv Gandhi to apply science and technology to drinking water, immunisation, literacy, oilseeds, telecommunications, and dairy. Each mission had time-bound targets, inter-ministerial coordination, and technology delivery to villages, with Sam Pitroda as adviser. For UPSC, they are the landmark example of mission-mode governance and the origin of India's telecom revolution.

Example: The telecom mission's C-DOT digital rural exchanges, which expanded rural telephone access across India.

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Technology-driven corruption

Technology-driven corruption is corruption that exploits digital systems: fake beneficiaries in welfare databases, manipulated e-tendering, data theft and cyber fraud against citizens and the state. Ironically, the same digital tools that enable it, like direct benefit transfer and e-governance, are the main weapons against it. For UPSC GS-3 and GS-4, it links cybersecurity, governance and ethics in a single theme.

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Tectonic earthquakes

Tectonic earthquakes are earthquakes caused by the movement of the earth's tectonic plates along faults, releasing accumulated strain. They are the most common and most destructive type.

Example: the 2001 Bhuj earthquake was a tectonic earthquake on an intra-plate fault

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Teesta

The Teesta is a Himalayan river rising in Sikkim, flowing south through West Bengal's Darjeeling and Jalpaiguri districts into Bangladesh, where it joins the Brahmaputra (Jamuna). About 414 km long, it supports hydropower, irrigation and the Teesta Barrage project. For UPSC, it matters for physical geography of Himalayan rivers and the India-Bangladesh water-sharing dispute.

Example: Teesta Barrage at Gajoldoba (irrigation project in West Bengal)

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Teesta (India-Bangladesh)

The fragment points to the Teesta water-sharing dispute between India and Bangladesh over division of the river's dry-season flow. A draft interim agreement was finalized during Prime Minister Manmohan Singh's 2011 Dhaka visit but was never signed after West Bengal objected. For UPSC, it is the textbook case of federal and bilateral friction in transboundary river negotiations.

Example: 2011 Dhaka visit (when the draft Teesta agreement was finalized)

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Teesta-III dam

The Teesta-III dam was the hydropower dam in Sikkim destroyed in October 2023 when a GLOF from South Lhonak lake sent a surge down the Teesta.

Example: Teesta-III's destruction showed how glacial hazards threaten Himalayan hydropower

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Tej Bahadur Sapru committee

The Sapru Committee was the 1944-45 constitutional committee chaired by liberal leader Tej Bahadur Sapru to propose a future constitution for India. Its 1945 report recommended fundamental rights, a federal union with responsible government and safeguards for minorities. For UPSC, it is an important pre-independence constitutional proposal linking the freedom movement to the framing of the Constitution.

Example: Tej Bahadur Sapru (chairman of the committee)

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Telangana

Telangana is India's 29th state, formed on 2 June 2014 by bifurcating Andhra Pradesh under the Andhra Pradesh Reorganisation Act, 2014, with Hyderabad as its capital. Its creation followed a decades-long statehood movement rooted in perceived regional neglect in jobs, water, and funds. For UPSC, it is the standard case study of state reorganisation under Article 3 and the politics of smaller states.

Example: The Srikrishna Committee (2010), appointed by the Centre to examine the Telangana statehood demand before the 2014 bifurcation.

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Telangana and Maharashtra

The pairing points to the Godavari water-sharing relationship between Telangana and Maharashtra, centered on barrages over the Godavari and its tributaries the Pranahita and Penganga. The two states signed a pact in 2016 for three barrages, though the Tummidihatti barrage height remains contested. For UPSC, it illustrates cooperative federalism and inter-state river dispute resolution.

Example: Tummidihatti barrage (disputed project on the Pranahita)

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Telangana armed struggle (1946-51)

The Telangana armed struggle was the 1946-51 peasant revolt in Hyderabad state, led by the Communist Party against the Nizam's rule and oppressive landlords (doras). Sparked by forced labour (vetti) and illegal exactions, it redistributed land to the tiller in liberated zones. For UPSC, it is a landmark peasant movement connecting the freedom struggle to post-independence land reforms.

Example: Communist Party of India (which led the struggle)

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Tele MANAS

Tele MANAS is the Tele Mental Health Assistance and Support initiative launched in October 2022 under the National Tele Mental Health Programme announced in the 2022-23 Budget. Operating through toll-free helplines and state cells anchored by NIMHANS Bengaluru, it offers free counselling, screening and referral. It anchors mental health governance and last-mile care debates. Example: the 14416 helpline connecting callers to state Tele MANAS cells.

Example: the 14416 helpline connecting callers to state Tele MANAS cells

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Tele-MANAS

Tele-MANAS is India's national tele-mental-health programme, launched on 10 October 2022 (World Mental Health Day). It provides free 24x7 counselling through the toll-free helplines 14416 and 1-800-891-4416 in multiple languages, with NIMHANS Bengaluru as the nodal centre. For UPSC, it is a flagship example of digital health governance and the state's response to the mental-health burden.

Example: NIMHANS Bengaluru (nodal centre of the programme)

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telecom and IT revolution

The telecom and IT revolution is India's post-1991 transformation into a global hub for telecom services and software exports, driven by liberalisation, the National Telecom Policy and a large English-speaking engineering workforce. It underpinned services-led growth and digital governance. UPSC: GS-3 economy and GS-2 e-governance.

Example: C-DOT, founded in 1984 under Sam Pitroda, which built India's indigenous digital telephone switching.

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Telecom Regulatory Authority

The Telecom Regulatory Authority is India's sectoral regulator for telecommunications, formally the Telecom Regulatory Authority of India (TRAI) set up under the 1997 Act. It regulates tariffs, interconnection and quality of service, protects consumer interests and curbs unsolicited commercial communication. Its orders shape competition in the digital economy. Example: TRAI's regulations curbing spam calls and messages.

Example: TRAI's regulations curbing spam calls and messages

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Telecom Regulatory Authority of India Act, 1997

The Telecom Regulatory Authority of India Act, 1997 is the statute establishing TRAI as the regulator for telecommunication services. It confers powers on tariffs, interconnection, quality of service and consumer protection, with the 2000 amendment creating the TDSAT for adjudication. It is the legal basis of telecom regulation in India. Example: tariff regulation for broadcasting and cable services under the Act.

Example: tariff regulation for broadcasting and cable services under the Act

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Telecom Security Operations Centre

The Defence Cyber Agency is the tri-service agency raised in 2019 to conduct cyber operations for the armed forces, headquartered in Delhi. It matters as the military's dedicated cyber arm, distinct from civilian agencies.

Example: The tri-service cyber command supporting military operations

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Teleoperated robots

Teleoperated robots are robotic systems controlled remotely by a human operator, who typically views the robot's environment through cameras and issues commands via a control interface. They combine human judgement with robotic precision, making them valuable in hazardous settings like bomb disposal, deep-sea exploration and nuclear cleanup where direct human presence is dangerous. Because the operator remains in the loop, teleoperation is also the stepping stone between manual tools and fully autonomous robots.

Example: Robotic surgical systems that let a surgeon sitting at a console replicate precise hand movements inside a patient's body from across the room.

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Telugu

Telugu is a Dravidian language and the official language of Andhra Pradesh and Telangana, spoken by over 80 million people. Written in its own Brahmi-derived script, it has a rich literary tradition from Nannaya's 11th-century Mahabharata translation onward, and was declared a classical language in 2008. For UPSC, it features in language, Eighth Schedule and classical-language questions.

Example: 2008 (year Telugu was declared a classical language)

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Telugu to a court language

The fragment points to Telugu's elevation as a court language under the Vijayanagara Empire, reaching its zenith under Krishnadevaraya (reigned 1509-1529). Himself a Telugu poet who wrote the Amuktamalyada, he patronized the Ashtadiggajas, the eight great Telugu poets of his court. For UPSC, it marks the golden age of Telugu literature in medieval South Indian history.

Example: Krishnadevaraya (emperor and Telugu poet)

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Temperature inversion

Temperature inversion is an atmospheric condition in which air temperature increases with altitude instead of decreasing, reversing the normal lapse rate. It traps pollutants near the surface, producing fog, smog and poor air quality, especially on calm winter nights. For UPSC, it is a standard physical-geography concept and explains episodes like Delhi's winter smog in environment questions.

Example: Delhi's winter smog (worsened by inversion layers)

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Temperature inversion profile

A temperature inversion profile is the vertical plot of temperature against altitude that shows the layer where temperature rises with height. Meteorologists use it to identify the inversion's base, depth and strength, which determine how strongly pollutants are trapped. For UPSC, it underpins geography and environment questions on atmospheric stability, fog formation and urban air pollution.

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Temple Entry Proclamation of 1936

The Temple Entry Proclamation was issued on 12 November 1936 by Chithira Thirunal Balarama Varma, the Maharaja of Travancore, throwing open all state-controlled temples to Hindus of every caste. A landmark against untouchability, it was hailed by Gandhi as a moral breakthrough. For UPSC, it is a key social-reform milestone in modern Indian history and temple-entry movements.

Example: Chithira Thirunal Balarama Varma (Maharaja who issued it)

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temple tank

A temple tank, called pushkarni or kalyani, is the stepped sacred water reservoir attached to South Indian temple complexes, used for ritual bathing, float festivals like teppotsavam and groundwater recharge. It is a distinctive feature of Dravidian temple architecture and water heritage. UPSC: GS-1 art and culture.

Example: The Golden Lotus Tank (Porthamarai Kulam) of the Meenakshi Temple in Madurai.

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temples of modern India

Temples of modern India is Jawaharlal Nehru's phrase for dams, steel plants and laboratories as the sacred sites of a modernising nation, expressing faith in science and public-sector-led development. It captures the post-independence developmental imagination. UPSC: GS-1 post-independence history and GS-3 infrastructure.

Example: The Bhakra-Nangal Dam, dedicated in 1963, with which Nehru's phrase is famously associated.

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ten books (mandalas)

The ten mandalas are the ten books into which the Rig Veda is divided, holding 1,028 hymns to deities such as Indra, Agni and Varuna. The older family books, mandalas 2 to 7, preserve the earliest picture of Vedic society, economy and polity. For UPSC GS-1 ancient history they are the primary source for reconstructing Early Vedic life.

Example: the Gayatri mantra occurs in mandala 3 (Rig Veda 3.62.10)

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Ten-Point Programme

The Ten-Point Programme was the socio-economic agenda adopted by the Congress in 1967 under Indira Gandhi, signaling a leftward shift. It called for bank nationalization, curbs on monopolies, ceilings on urban property and income, and stronger public control of the economy. For UPSC, it explains the political run-up to the 1969 nationalization of 14 major banks and the Garibi Hatao era.

Example: Nationalization of 14 banks (1969, its most famous follow-through)

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Tenali Ramakrishna

Tenali Ramakrishna was the Telugu poet and court jester in Krishnadevaraya's Vijayanagara court, counted among the Ashtadiggajas, the eight great Telugu poets. His major work is the Panduranga Mahatyam, and his wit made him the hero of the popular Tenali Raman folk tales. For UPSC, he represents Vijayanagara court culture and the golden age of Telugu literature.

Example: Panduranga Mahatyam (his major poetic work)

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Tenancy reform

Tenancy reform is the land-reform component regulating landlord-tenant relations through rent caps, security of tenure and ownership rights for tenants. It includes conferring ownership on long-term tenants and protecting sharecroppers from eviction. For UPSC it is the reform that most directly touched the cultivator's life.

Example: Operation Barga's recording of bargadars in West Bengal is tenancy reform's showcase success.

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tenants with no ownership rights

Tenants with no ownership rights are cultivators who farm land owned by others without secure tenancy or title, and can be evicted or charged rack rents at the landlord's will. Colonial revenue settlements often left them legally unprotected. Land reforms that recorded and protected such tenants are a staple of UPSC GS-3 agriculture, covering tenancy laws and agrarian structure.

Example: Operation Barga in West Bengal (1978) registered sharecroppers to give them heritable tenancy rights

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Tendulkar

In UPSC usage, Tendulkar refers to economist Suresh Tendulkar, who chaired the 2009 expert committee on poverty estimation. The committee shifted methodology from calorie norms to a consumption basket with updated prices, estimating 37.2% poverty for 2004-05. For UPSC, the Tendulkar poverty line is the standard reference in economy questions on poverty measurement before the Rangarajan review.

Example: Tendulkar Committee report (2009, on poverty estimation)

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Tendulkar Committee

The Tendulkar Committee (chaired by Suresh Tendulkar, report 2009) revised India's official poverty estimation methodology. It moved away from calorie norms to a consumption basket including food, education, and health, and used a uniform mixed recall period, raising the estimated poverty ratio for 2004-05 to 37.2 percent. For UPSC, it is the turning point between the Lakdawala and Rangarajan methods and a staple of poverty-measurement questions.

Example: Its 2009 report, which re-estimated 2004-05 poverty at 37.2 percent, sharply higher than earlier official figures.

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Tennis Court Oath 1789

The Tennis Court Oath of June 1789 is the pledge by the deputies of the Third Estate, locked out of their hall, not to disperse until France had a constitution. It converted a tax assembly into a revolutionary National Assembly.

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Tennis Court Oath of June 1789

The Tennis Court Oath of June 1789 is the pledge taken on 20 June 1789 by the members of France's Third Estate, who, locked out of the Estates-General hall at Versailles, gathered in a tennis court and swore not to disperse until a constitution was framed. It marked the Third Estate's open defiance of the monarchy and the birth of the National Assembly. For UPSC, it is the symbolic starting point of the French Revolution in GS-1 world history.

Example: 20 June 1789, the oath-taking at Versailles

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tension

The tension, in UPSC answers, is the clash between two legitimate goals that policy must balance: growth versus equity, development versus environment, Centre versus states, or security versus liberty. Naming the tension precisely is the first step of a balanced mains answer, because it shows the examiner that both sides have been weighed before a conclusion is offered.

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tentative list

A tentative list is the inventory of cultural and natural properties that a country submits to UNESCO as candidates for future World Heritage inscription. A property must spend at least a year on the list before it can be nominated, so placement is the mandatory first step toward the World Heritage tag. For UPSC GS-1 art and culture and prelims current affairs, new additions are frequent questions.

Example: India placed the Rangpur-Sivasagar Historic Ensemble of Assam on its tentative list in 2026

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Tenth Plan

The Tenth Plan is India's Tenth Five Year Plan, operational from 2002 to 2007. It targeted 8 percent average annual GDP growth and was the first plan to fix monitorable socio-economic targets, covering poverty reduction, literacy, infant and maternal mortality, and forest cover, alongside economic growth. It achieved about 7.6 percent growth. For UPSC, it is a core prelims fact in GS-3 economic planning and a mains reference for target-based planning.

Example: The 8 percent annual GDP growth target

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Tenth Plan (2002-07)

The Tenth Plan (2002-07) is the truncated key for India's Tenth Five Year Plan, the plan period running from 2002 to 2007 under the Planning Commission. It aimed at 8 percent annual GDP growth with monitorable targets for poverty, literacy, health and environment, and recorded growth of roughly 7.6 percent. The open parenthesis in the key is an extraction fragment; the complete concept is the full plan period. For UPSC, it belongs to GS-3 planning-history chronology asked in prelims.

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Tenth Schedule

The Tenth Schedule is the anti-defection law of the Constitution, inserted by the 52nd Amendment in 1985. It disqualifies legislators who voluntarily give up party membership or vote against the party whip, with exemptions for mergers backed by two-thirds of members and for presiding officers. The presiding officer decides disqualification petitions, subject to judicial review after Kihoto Hollohan (1992). For UPSC, it is a staple of GS-2 polity, tested on disqualification grounds and the Speaker's role.

Example: Kihoto Hollohan v. Zachillhu (1992), which upheld the Schedule

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Tenure

Tenure is the fixed period for which a person holds an office or post. In the UPSC syllabus the term matters mainly as security of tenure, the protection that lets constitutional functionaries and civil servants act without fear of arbitrary removal, as with judges, the CAG and election commissioners. It is a recurring theme in questions on institutional independence, bureaucratic transfers, and the balance between accountability and autonomy in governance.

Example: The Chief Election Commissioner's six-year tenure, with removal possible only in the manner of a Supreme Court judge.

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tenure insecurity and poverty

Tenure insecurity is the lack of secure, legally recognised rights over land, and it is both a cause and a consequence of poverty. People who cannot prove ownership avoid long-term investments such as soil conservation or tree planting, and they can be displaced by more powerful claimants. Because degraded land lowers productivity and incomes, insecure tenure feeds a cycle of land degradation and deepening poverty.

Example: The Forest Rights Act, 2006 was enacted partly to correct historical injustice by recognising the land and forest rights of tribal and forest-dwelling communities.

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Terahertz (THz) frequencies

Terahertz frequencies are the extremely high frequency bands, around 95 GHz to 3 THz, that 6G research targets for vastly higher capacity than 5G. They offer high data rates but suffer narrow beams and penetration losses.

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Term

Term is a generic word for a word or phrase with a fixed meaning, or for a fixed period of office. In UPSC preparation it most often points to tenures of constitutional functionaries, such as the President's five-year term, a Supreme Court judge's tenure until age 65, or the CAG's six-year term, and to the time-bound mandates of commissions and committees. Reading the exact term of each office is a recurring prelims requirement in GS-2 polity.

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Terminal defence

Terminal defence is the innermost layer of air defence, intercepting incoming threats in their final approach over the target, using very-short-range systems and counter-drone grids. It matters as the last line protecting high-value installations.

Example: Counter-UAS grids defending airbases

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terracotta

Terracotta is baked clay shaped into sculpture, figurines, plaques and architectural ornament. It is among the oldest art media of the subcontinent, used for Harappan mother-goddess figurines, votive toys and, later, temple decoration across Bengal. For UPSC GS-1 art and culture it links craft technology, religious iconography and regional temple styles.

Example: the famous Mother Goddess figurine excavated at Mohenjo-daro

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terracotta temples of Vishnupur

The terracotta temples of Bishnupur (Vishnupur) in Bankura district, West Bengal, are brick temples faced with carved terracotta tiles depicting Krishna legends, the Ramayana and the Mahabharata. Built by the Malla kings in the 17th and 18th centuries, they fuse Bengal hut-shaped roofs with Vaishnavite devotion. They are a standard UPSC GS-1 example of regional temple architecture.

Example: the Rasmancha, commissioned by Malla king Bir Hambir in 1600

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territorial

In intellectual property law, 'territorial' means that IP rights exist only within the jurisdiction that grants them. A patent granted in India protects the invention only in India, which is why firms must file separately in each country where they want protection. International systems such as the Patent Cooperation Treaty exist to simplify this multi-country filing.

Example: A company that patents a drug in India must file a separate application in the United States to stop copying there.

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territorial states

Territorial states are large kingdoms with defined boundaries, standing armies, bureaucracies and regular taxation, which replaced smaller chiefdoms in the 6th century BCE. Their rise marks India's second urbanisation and the shift from tribe to territory. The sixteen mahajanapadas are the classic UPSC GS-1 case study of this transition in ancient Indian polity.

Example: Magadha, which rose to dominance under Bimbisara in the 6th century BCE

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Terror-organised crime nexus

The terror-organised crime nexus is the symbiotic link where terrorist groups use criminal networks for funds, weapons and logistics, and criminals use terror networks for protection and firepower. It matters because countering either threat in isolation fails, as D-Company's alleged role in terror financing shows.

Example: Drug syndicates moving arms for militant groups in Punjab

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Terrorism

Terrorism is the use of violence against civilians and the state to create fear for political ends. India has no statutory global definition to rely on, which is why the Comprehensive Convention on International Terrorism remains stalled. It matters as the central internal-security threat, from cross-border groups to online-radicalised lone actors.

Example: The 26/11 Mumbai attacks as the defining terror strike on India

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tertiary consumers

Tertiary consumers are the organisms at the third consumer level of a food chain, feeding on secondary consumers. They are usually top predators or carnivores that sit near the apex of the energy pyramid, such as large fish, birds of prey, or big cats. Because energy is lost at each trophic level, tertiary consumers are the fewest in number in any ecosystem.

Example: A hawk that feeds on snakes, which themselves feed on frogs, is a tertiary consumer.

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tertiary sector

The tertiary sector is the services segment of the economy, covering trade, transport, finance, IT, education, health and public administration. It now contributes the largest share of India's output and employment growth, and drove growth after the 1991 liberalisation. For UPSC GS-3, sectoral shares, services-led growth and its limits are recurring economy questions.

Example: services account for over half of India's gross value added

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Tessy Thomas

Tessy Thomas is a senior Indian aerospace scientist with the Defence Research and Development Organisation (DRDO), popularly known as India's 'Missile Woman'. In 2009 she became the first woman in India to head a major missile project when she was appointed project director of the Agni-IV ballistic missile, and she later served as project director (mission) for Agni-V, with deep expertise in guidance, navigation and solid propellant systems. She subsequently rose to Director General of Aeronautical Systems at DRDO.

Example: The successful 2011 flight test of Agni-IV, a long-range ballistic missile developed under her leadership as project director.

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Test

Test is a generic word for a trial or examination used to measure knowledge or skill. In UPSC preparation it denotes the three-stage Civil Services Examination itself, comprising Prelims, Mains and the Interview, and also the mock tests aspirants take to benchmark readiness. Regular timed self-testing builds answer-writing discipline and elimination skills for objective papers. For UPSC, treat testing as a preparation method rather than a syllabus topic, with no fixed definition to memorise.

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test case

The test case, in UPSC usage, is the landmark event, judgment, or policy episode cited to check whether a principle or institution works in practice. A scheme's outcomes test its design, a judgment tests constitutional interpretation, and a crisis tests administrative capacity. Mains answers gain weight when abstract claims are anchored to such concrete test cases rather than left as assertions.

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tested toolkit

A tested toolkit is a set of policy instruments whose effectiveness has been proven through repeated use in past crises, so policymakers reach for it with confidence. In UPSC GS-3 economy answers the phrase usually covers the RBI's monetary tools, such as the repo rate, cash reserve ratio and open market operations, deployed across cycles from 1991 to the pandemic.

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Teton dam

The Teton dam was the US earthen dam that collapsed in Idaho in June 1976 during its first filling, killing 11 people. Its failure reshaped dam-safety engineering worldwide.

Example: Teton is a textbook case of internal erosion failure

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Tevaram

Tevaram is the corpus of Tamil Saivite devotional hymns composed by the Nayanar saints Appar, Sambandar and Sundarar between the 7th and 9th centuries CE. Sung in praise of Shiva at temple shrines across Tamil Nadu, these hymns form the first seven books of the twelve-book Tirumurai canon and are the earliest literary expression of the Bhakti movement. For UPSC, Tevaram is a high-yield prelims fact in GS-1 art, culture and medieval religious history.

Example: The Nayanar saints Appar, Sambandar and Sundarar

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Textile Labour Association (Majoor Mahajan Sangh, 1920)

The Textile Labour Association (Majoor Mahajan Sangh, 1920) is the Ahmedabad textile workers' union founded in 1920 by Anasuya Sarabhai with Mahatma Gandhi's guidance. It pioneered non-violent, arbitration-based trade unionism, settling disputes through negotiation rather than strikes and running welfare activities for workers. The open parenthesis in the key is an extraction fragment; the complete concept is the full association. For UPSC, it is a classic GS-1 example of Gandhian constructive labour organisation.

Example: Anasuya Sarabhai founding the union at Ahmedabad in 1920

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textiles

Textiles is the fibre-to-fabric industry spanning cotton, jute, silk, wool and synthetics, from handlooms to modern mills. It is India's second-largest employer after agriculture, a major export earner and a focus of industrial policy. For UPSC GS-3 it connects employment, exports, MSMEs and schemes for the sector.

Example: seven PM MITRA mega textile parks were announced in 2023

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TFFF

TFFF stands for the Tropical Forests Forever Facility, a fund launched by Brazil at the COP30 climate summit in 2025. It is a performance-based mechanism that pays countries for keeping their tropical forests standing, roughly per hectare of conserved forest, with an initial goal of 10 billion dollars in public capital towards a 125 billion dollar endowment.

Example: Germany, Norway, Brazil and France pledged billions to the TFFF at COP30.

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TFR

TFR, or Total Fertility Rate, is the average number of children a woman would bear over her lifetime at current age-specific fertility rates. The replacement level is 2.1, and India's TFR fell to 2.0 in NFHS-5 (2019-21), signalling movement toward population stabilisation. It drives debates on demography, ageing and future delimitation. Example: Bihar's TFR of about 3 contrasting with Kerala's 1.8.

Example: Bihar's TFR of about 3 contrasting with Kerala's 1.8

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Thag La

Thag La is a strategically vital ridge in the Tawang sector of Arunachal Pradesh, lying north of the Namka Chu river near the McMahon Line. In 1962 India's attempt to occupy the Chinese-held ridge under the Forward Policy became the casus belli for China's October offensive, and the Indian brigade deployed below it at Namka Chu was overrun on 20 October 1962. For UPSC, Thag La anchors GS-1 modern history and GS-3 internal security questions on the 1962 Sino-Indian war.

Example: The Battle of Namka Chu, 20 October 1962

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Thalghat

Thalghat is the Thal Ghat, a mountain pass through the Western Ghats in Maharashtra on the Mumbai-Nashik route. It carries the busy rail and road corridor linking Mumbai with Nashik via Kasara, making it one of the two great Sahyadri crossings along with the Bhor Ghat on the Mumbai-Pune axis. For UPSC, Thalghat is a standard prelims map fact in GS-1 physical geography, often paired with Bhor Ghat and Palghat in pass-based questions.

Example: Kasara, the town at the ghat on the Mumbai-Nashik corridor

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thanas

Thanas are police-station jurisdictions, the basic rural policing unit inherited from the Mughal period and modernised by the British. Lord Cornwallis divided Bengal's districts into thanas in 1792, each headed by an Indian officer called the daroga, while stripping zamindars of police powers. The thana-daroga system is a standard UPSC GS-1 topic in British administrative reforms.

Example: the Indian Police Act of 1861 later built the modern police force on this foundation

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Thanesar

Thanesar (Thaneshwar) in present-day Haryana was the capital of the Pushyabhuti (Vardhana) dynasty under Prabhakaravardhana and the early reign of Harshavardhana. As a political and religious centre in the early 7th century, it anchors the transition from Gupta decline to Harsha's empire. For UPSC, it is the starting point of Harshavardhana's polity and a marker in post-Gupta history.

Example: Harshavardhana ruling from Thanesar before shifting his capital to Kannauj.

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Thanjavur

Thanjavur in Tamil Nadu was the imperial capital of the Cholas under Rajaraja I and Rajendra I, and the site of the Brihadisvara Temple (Rajarajeshwaram), completed around 1010 CE and now a UNESCO World Heritage site. Its bronze sculpture tradition and temple inscriptions document Chola administration, land grants, and maritime power. For UPSC, it is the classic illustration of Chola art, architecture, and statecraft.

Example: Rajaraja I's Brihadisvara Temple at Thanjavur, built around 1010 CE with its towering vimana.

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Thar

Thar is the Great Indian Desert, an arid region covering western Rajasthan and extending into Gujarat, Punjab and Haryana, with about 85 percent of its area in Rajasthan. Characterised by sand dunes, scanty rainfall and the ephemeral Luni river, it supports pastoral and irrigated agriculture where the Indira Gandhi Canal reaches. For UPSC, Thar is central to GS-1 geography and GS-3 environment, linking desertification, canal irrigation and desert ecology.

Example: The Indira Gandhi Canal, which greens parts of the desert

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That pipeline has been in abeyance since 2022-23

That pipeline has been in abeyance since 2022-23 is a truncated phrase referring to the welfare-delivery pipeline for minorities, specifically the three flagship scholarship schemes of the Ministry of Minority Affairs, Pre-Matric, Post-Matric and Merit-cum-Means, which were placed in abeyance from 2022-23 pending redesign and rationalisation. It illustrates the gap between announced welfare and actual delivery. For UPSC, it is a GS-2 mains data point on minority welfare, the Sachar follow-up and scheme implementation.

Example: The Pre-Matric, Post-Matric and Merit-cum-Means scholarship schemes

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The Convention on Biological Diversity (CBD)

The Convention on Biological Diversity is a legally binding international treaty adopted at the 1992 Rio Earth Summit to conserve biological diversity, ensure sustainable use of its components, and secure fair and equitable sharing of benefits from genetic resources. With 196 parties, it anchors national biodiversity strategies, the Kunming-Montreal framework and the Nagoya Protocol on access and benefit-sharing.

Example: India's Biological Diversity Act of 2002 implements the CBD's obligations through the National Biodiversity Authority and state boards.

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The digital economy

The digital economy is the part of economic activity driven by digital technologies, data and connectivity, covering e-commerce, digital services, platform businesses and digitally enabled production. It is marked by near-zero marginal costs, strong network effects and data as a key factor of production, and it now accounts for a fast-growing share of India's GDP.

Example: The Unified Payments Interface (UPI), which processes billions of digital transactions every month and underpins India's digital payments ecosystem.

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The energy transition

The energy transition is the global shift from fossil-fuel-based energy systems to low- or zero-carbon sources such as solar, wind, hydro and green hydrogen, combined with energy efficiency and electrification of transport and industry. For India it means meeting fast-rising electricity demand while honouring its net-zero-by-2070 pledge through massive renewable capacity addition.

Example: India's National Green Hydrogen Mission, which targets 5 million tonnes of annual green hydrogen production by 2030.

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The Internet of Things (IoT)

The Internet of Things is a network of physical objects embedded with sensors, software and connectivity that collect and exchange data over the internet without direct human intervention. It enables real-time monitoring and automation across sectors, from smart electricity meters and precision agriculture to factory sensors and wearable health devices.

Example: India's smart electricity metering programme, which is deploying crores of IoT-enabled meters that report consumption remotely and help utilities cut losses.

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Theatre Command

A Theatre Command is a unified tri-service command for a geographic theatre, integrating Army, Navy and Air Force assets under one commander. India plans to replace its 17 service-specific commands with integrated theatres. It matters as the operational end-state of jointness.

Example: The proposed maritime and land theatre commands

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theft and smuggling

Theft and smuggling in the UPSC context usually means the illicit trade in cultural property, wildlife, drugs, arms or counterfeit goods across borders. It implicates the Antiquities and Art Treasures Act of 1972, CITES for wildlife and agencies like the DRI and CBI. For GS-3 internal security and GS-1 heritage, it links crime, conservation and international cooperation.

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Theil's index

Theil's index is an entropy-based statistical measure of economic inequality developed by Dutch econometrician Henri Theil. It measures how far an income distribution sits from perfect equality: a value of zero means complete equality, and higher values signal greater concentration. Unlike the Gini coefficient, it decomposes neatly into within-group and between-group inequality, revealing where disparity originates. It appears in GS-3 questions on inclusive growth.

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Thematic Hubs

The Thematic Hubs are the four research hubs through which India's National Quantum Mission (Rs 6,003.65 crore, 2023 to 2031) is executed under a hub-spoke-spike model. They cover quantum computing at IISc Bengaluru, quantum communication at IIT Madras with C-DOT, quantum sensing and metrology at IIT Bombay, and quantum materials and devices at IIT Delhi, with a target of building up to 1,000-qubit quantum computers in eight years. Each hub anchors a national network of researchers, startups and industry partners.

Example: The quantum computing hub at IISc Bengaluru, tasked with developing intermediate-scale superconducting quantum computers.

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Theme: Vasudhaiva Kutumbakam

Vasudhaiva Kutumbakam is a Sanskrit phrase meaning 'the world is one family', drawn from the Maha Upanishad. It was the theme of India's G20 presidency, rendered in English as 'One Earth, One Family, One Future' at the New Delhi Leaders' Summit in September 2023. It frames India's civilisational pitch for cooperative global governance on climate, development, and digital public infrastructure, and it is asked in GS-2 and prelims culture questions.

Example: the 18th G20 Summit, New Delhi, 9-10 September 2023

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Theory

Theory, in UPSC usage, is a systematic explanation of how something works, from which testable claims follow. Theories organise facts across the syllabus: separation of powers in polity, comparative advantage in economics, utilitarianism in ethics. Answers score higher when facts are anchored to the relevant theory instead of being listed, because theory shows the examiner a framework rather than memory alone.

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Theory of Kingship

The theory of kingship is the body of ideas explaining the origin, legitimacy, and duties of the ruler in Indian political thought. Traditions include the divine theory of the Manusmriti, the contract theory of the Shantiparva and Arthashastra (people chose a king to end matsya-nyaya, the law of the fishes), and the paternal ideal. The king's dharma centred on protection, justice, and welfare, and the theme recurs in GS-1 ancient history.

Example: Kautilya's Arthashastra

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Theosophical Society

The Theosophical Society is a spiritual organisation founded in New York in 1875 by Helena Blavatsky and Henry Steel Olcott to promote universal brotherhood and the study of comparative religion. Its headquarters moved to Adyar, Madras, in 1882. Under Annie Besant, who joined in 1889, it championed Indian culture and education and entered nationalist politics. It is a standard GS-1 topic under the socio-religious reform movement.

Example: Annie Besant's Home Rule League, 1916

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Theranostics

Theranostics is a medical approach that fuses diagnostics and therapy into a single strategy, using a paired agent that both locates diseased tissue and delivers treatment to it. In nanotechnology, specially engineered nanoparticles can image a tumour and simultaneously release a drug at the site, allowing personalised dosing and real-time monitoring of treatment response. It is a flagship example of precision medicine, where the same molecular target guides both detection and cure.

Example: Radioligand therapy for prostate cancer, where a radioactive tracer first images PSMA-positive tumours and then delivers targeted radiation to the same cells.

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Theravada/Hinayana

Theravada, also called Hinayana ('the lesser vehicle', a label its followers reject), is the oldest surviving school of Buddhism. It holds to the Pali canon and the ideal of the arhat, who attains nirvana through personal discipline, in contrast to Mahayana's bodhisattva ideal and Sanskrit scriptures. It spread to Sri Lanka and Southeast Asia after Ashoka's missions, and it is core to GS-1 ancient history and art-culture.

Example: Mahinda's mission to Sri Lanka in the 3rd century BCE

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thermal reactor is

A thermal reactor is a nuclear reactor in which fission is sustained by slow (thermal) neutrons, produced by moderating fast neutrons with water or heavy water. Most commercial reactors, including India's pressurised heavy water reactors, are thermal reactors; they need enriched or natural uranium but simpler fuel cycles than fast reactors. It matters for UPSC because thermal reactors form the first stage of India's three-stage nuclear programme.

Example: India's fleet of pressurised heavy water reactors (PHWRs), which generate the bulk of the country's nuclear electricity.

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Thermidorian Reaction 1794

The Thermidorian Reaction of July 1794 is the overthrow of Robespierre and the end of the Reign of Terror. It began the French Revolution's conservative turn, leading through the Directory to Napoleon's coup of 1799.

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Thermidorian Reaction of July 1794

The Thermidorian Reaction of July 1794 is the phase of the French Revolution in which the National Convention turned against Maximilien Robespierre, arresting and guillotining him on 28 July (10 Thermidor). It ended the Reign of Terror, curbed the Committee of Public Safety, and restored moderate control, paving the way for the Directory. It shows how revolutions devour their own radicals, a favourite world-history theme.

Example: the execution of Robespierre, 28 July 1794

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thermohaline circulation

Thermohaline circulation is the deep-ocean conveyor driven by differences in temperature and salinity that make water denser and sink. It moves heat, nutrients and carbon around the planet over centuries, shaping regional climates far from the poles. For UPSC GS-1 physical geography it explains ocean currents, the monsoon system and climate-change feedbacks.

Example: the Atlantic Meridional Overturning Circulation carries warm surface water toward the North Atlantic

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Thinker

The thinker, in UPSC answers, is the political philosopher or social thinker whose ideas frame a question: Plato, Aristotle, Kautilya, Hobbes, Locke, Rousseau, Marx, Gandhi, or Ambedkar. Quoting a thinker precisely, with the work and its context, lifts an answer from description to analysis. Examiners reward this anchoring in both GS-2 political theory and GS-4 ethics.

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Third (1961-66)

The Third Five-Year Plan (1961-66) is India's development plan of that period, nicknamed the Gadgil Yojana after Planning Commission deputy chairman D. R. Gadgil. It targeted self-reliant growth at 5.6 per cent a year with balanced stress on agriculture and industry. The 1962 and 1965 wars and severe droughts derailed it, holding actual growth to about 2.4 per cent. It was followed by the Plan Holiday of 1966-69, and it is a staple of prelims economy questions.

Example: the Plan Holiday, 1966-69

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Third Battle of Panipat

The Third Battle of Panipat was fought on 14 January 1761 between the Maratha confederacy under Sadashivrao Bhau and the Afghan forces of Ahmad Shah Abdali. The Marathas suffered a crushing defeat that halted their northward expansion and deepened the 18th-century power vacuum. For UPSC GS-1 it is the landmark battle explaining the Maratha decline before British ascendancy.

Example: it was fought at Panipat, in present-day Haryana

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Third Battle of Panipat (14 January 1761)

The Third Battle of Panipat is the 14 January 1761 clash in which Ahmad Shah Abdali's Afghan forces decisively defeated the Maratha army led by Sadashivrao Bhau. The loss of a generation of Maratha leadership shattered their bid for pan-Indian dominance and cleared the field for British expansion. It is a landmark prelims date and a classic mains turning point in the political disintegration of 18th-century India.

Example: Sadashivrao Bhau, the Maratha commander at Panipat

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Third Estate

The Third Estate is the commoners of pre-revolutionary France: everyone outside the clergy (First Estate) and nobility (Second Estate), from the bourgeoisie to the peasantry, who paid nearly all the taxes while the privileged orders paid almost none. Its demand for voting by head in the Estates-General of 1789 triggered the Revolution. The concept is essential for world-history questions on the French Revolution's causes.

Example: the Tennis Court Oath, 20 June 1789

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third gender

Third gender is the legal and social category for persons whose gender identity does not fit the male-female binary, principally transgender persons in India. The Supreme Court in NALSA v. Union of India (2014) recognized transgender persons as a third gender entitled to equal rights, and the Transgender Persons (Protection of Rights) Act, 2019 gave the identity statutory backing. It is a staple of GS-1 society and GS-2 rights questions.

Example: Census 2011 enumerated about 4.88 lakh persons under the 'other' gender category, the first official count of India's third-gender population.

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Third Pay Commission

The Third Pay Commission, constituted in April 1970 under Raghubir Dayal, submitted its report in March 1973. It accepted in principle the demand for a need-based minimum wage and recommended Rs 185 per month, which the government raised to Rs 196, while addressing pay parity between civilian employees and the armed forces.

Example: its pay scales governed central government compensation through the 1970s and 1980s

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Third Plan

The Third Plan is shorthand for India's Third Five-Year Plan (1961-66), the Gadgil Yojana, which aimed at self-sustained growth of 5.6 per cent a year through heavy industry alongside agriculture. Wars with China in 1962 and Pakistan in 1965, plus the droughts of 1965-66, cut achievement to roughly 2.4 per cent and forced the Plan Holiday of 1966-69. Its targets and failures are frequently asked in prelims.

Example: D. R. Gadgil, the Planning Commission deputy chairman after whom the plan is nicknamed

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Third Plan (1961-66)

The Third Plan (1961-66) is India's third five-year development plan, designed to make the economy self-reliant and self-generating, with emphasis on basic and heavy industries alongside agriculture. Its ambitions collapsed under the 1962 and 1965 wars and back-to-back droughts, yielding only about 2.4 per cent annual growth against a 5.6 per cent target. The plan's shortfall is a classic prelims fact set on planning history.

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Third Plan's

The Third Plan's defining feature is its ambition-reality gap: it promised self-reliant growth at 5.6 per cent a year, but wars and droughts held achievement to about 2.4 per cent, teaching planners the cost of neglecting agriculture and defence preparedness. The possessive form appears in questions about the plan's targets, outlay, and failures. It remains core GS-3 material on India's planning experience.

Example: the Sino-Indian war of 1962

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Third reading

The third reading is the final stage of a bill's passage in a House of Parliament, when the bill is debated and voted on in its finished form. At this stage only verbal, formal, or consequential amendments are permitted, so no fresh substantive changes can be introduced. If passed, the bill moves to the other House or to the President for assent. It is a standard GS-2 polity procedure question.

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Third Schedule

The Third Schedule of the Constitution prescribes the forms of oaths and affirmations for Union and state ministers, members of Parliament and state legislatures, judges of the Supreme Court and High Courts, and the Comptroller and Auditor General. Every oath affirms allegiance to the Constitution and a commitment to uphold the sovereignty and integrity of India.

Example: a newly elected MP must subscribe to the Third Schedule oath before taking a seat in the House

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Third UN World Conference on Disaster Risk Reduction

The Third UN World Conference on Disaster Risk Reduction was the March 2015 conference in Sendai, Japan, that adopted the Sendai Framework for Disaster Risk Reduction (2015-2030). It brought together thousands of delegates from UN member states.

Example: the Sendai Framework's seven targets were negotiated at this conference

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Third War (1790-92)

The Third Anglo-Mysore War (1790-92) is the conflict in which a British-led alliance under Lord Cornwallis, joined by the Marathas and the Nizam, defeated Tipu Sultan of Mysore. It ended with the Treaty of Seringapatam in 1792, by which Tipu ceded half his territory, paid a heavy indemnity, and surrendered two sons as hostages. The war and its treaty form a key prelims date pair in modern history.

Example: the Treaty of Seringapatam, 1792

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Third War (1817-18)

The Third Anglo-Maratha War (1817-18) is the conflict in which Governor-General Hastings crushed the Maratha confederacy, defeating Peshwa Baji Rao II and his allies at Khadki, Sitabuldi, and Mahidpur. It ended Maratha independence: the Peshwaship was abolished, vast territories passed to the Bombay Presidency, and British paramountcy over India became unchallengeable. It is the last great war of British conquest.

Example: Baji Rao II, the last Peshwa

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third wave

A third wave is the third distinct surge in a sequence of events, most familiar in epidemiology as a renewed spike of infections. In UPSC current-affairs usage it usually denotes the Omicron-driven third COVID-19 wave in India. For GS-3 disaster management and health it illustrates pandemic waves, variant behaviour and public-health response cycles.

Example: India's Omicron-driven COVID-19 wave peaked in January 2022

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thirteen

Thirteen is the cardinal number after twelve, used in UPSC contexts chiefly as an ordinal in numbered institutions and plans. The most cited is the Thirteenth Finance Commission, whose award period and recommendations remain reference points in fiscal federalism. For prelims, commission numbers and their chairpersons are classic factual questions.

Example: the Thirteenth Finance Commission (2010-15) was chaired by Vijay Kelkar

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thirteen laws

The thirteen laws are the land-reform statutes that the Constitution (First Amendment) Act, 1951 first placed in the newly created Ninth Schedule to shield zamindari abolition from judicial review. Later amendments added hundreds more entries, and the Supreme Court in I.R. Coelho (2007) held that even Ninth Schedule laws must pass the basic-structure test. It serves GS2 polity: fundamental rights, the Ninth Schedule, and judicial review.

Example: The Constitution (First Amendment) Act, 1951, which created the Ninth Schedule and Articles 31A and 31B.

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Thomas Committee

The Thomas Committee was the monitoring committee headed by former Supreme Court judge K.T. Thomas, set up by the Supreme Court in 2008 to oversee implementation of its police-reform directives in the Prakash Singh case. It found that 17 of the 18 states which enacted new police laws had diluted the Court's directions, prompting contempt proceedings over non-compliance.

Example: its findings anchor the continuing Supreme Court monitoring of police reforms

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Thomas Hobbes

Thomas Hobbes (1588-1679) was the English philosopher of Leviathan (1651), who argued that without a sovereign, life is solitary, poor, nasty, brutish and short, so individuals surrender freedom for security. He is the essay's spokesman for the authority side of the freedom-versus-authority tension. He anchors every argument that order precedes liberty.

Example: Hobbes's Leviathan (1651), justifying absolute sovereignty as the price of escaping anarchy.

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Thomas Hobbes (Leviathan)

Thomas Hobbes is the English philosopher whose 1651 work Leviathan founded modern social-contract theory. He argued that in the state of nature life is 'solitary, poor, nasty, brutish, and short', so rational people surrender freedoms to an absolute sovereign in exchange for security and order. His ideas underpin debates on state power, authority, and individual rights in GS-2 political theory and GS-4 ethics.

Example: Leviathan, published in 1651

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Thomas Munro

Thomas Munro is the British administrator who introduced the Ryotwari settlement in the Madras Presidency around 1820. Under ryotwari, the state settled land revenue directly with the peasant (ryot), bypassing zamindars, though rates were periodically revised upward. Munro later served as Governor of Madras and favoured Indian education and the employment of Indians. He is a fixture of GS-1 questions on land-revenue systems.

Example: the Ryotwari settlement in the Madras Presidency, introduced around 1820

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Thomas Paine's

Thomas Paine is the English-American radical pamphleteer whose writings fuelled the American and French revolutions. Common Sense (1776) made the case for American independence in plain, popular language, while The Rights of Man (1791) defended the French Revolution and popular sovereignty against Edmund Burke. His work connects natural rights to modern democracy and recurs in world-history questions.

Example: Common Sense, published in 1776

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thorium

Thorium is a naturally occurring radioactive element, abundant in India's monazite sands, that can be converted into fissile uranium-233 for nuclear fuel. India holds one of the world's largest thorium reserves, and thorium powers the third stage of Homi Bhabha's three-stage nuclear programme. It serves GS3 science and technology: energy security and nuclear policy.

Example: The monazite-rich beach sands of Chavara, Kerala, mined by Indian Rare Earths.

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Threatened species

Threatened species is the collective label for species assessed as Critically Endangered, Endangered or Vulnerable on the IUCN Red List.

Example: The Bengal tiger (Endangered) and the clouded leopard (Vulnerable) are both threatened species.

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three different lists

The three different lists are the Seventh Schedule's division of legislative subjects into the Union List, the State List, and the Concurrent List under Articles 245 to 246. Parliament alone legislates on the Union List, states on the State List, and both on the Concurrent List, where Union law prevails in a clash. It serves GS2 polity: Centre-state legislative relations and federalism.

Example: Entry 82 of the Union List, taxes on income other than agricultural income.

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three external members

The three external members are the government-appointed, non-RBI members of the six-member Monetary Policy Committee, which fixes India's repo rate to hold CPI inflation near the 4 per cent target. They serve four-year terms alongside the RBI Governor, the Deputy Governor, and one RBI officer. It serves GS3 economy: monetary policy and inflation targeting.

Example: Ram Singh, Saugata Bhattacharya and Nagesh Kumar, appointed on 1 October 2024.

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three farm laws of 2020

The three farm laws of 2020 are the Farmers' Produce Trade and Commerce (Promotion and Facilitation) Act, the Farmers (Empowerment and Protection) Agreement on Price Assurance and Farm Services Act, and the Essential Commodities (Amendment) Act. They opened private trade outside mandis, legalised contract farming, and eased stock limits. It serves GS3 agriculture and GS2 polity: federalism and Centre-state relations.

Example: The Prime Minister's announcement on 19 November 2021 repealing all three Acts after year-long farmer protests.

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three legislative lists

The three legislative lists are the Union List, State List, and Concurrent List in the Seventh Schedule, dividing law-making power between Parliament and state legislatures under Article 246. Parliament has exclusive power over the Union List and states over the State List, while both share the Concurrent List, where central law prevails in conflict. It serves GS2 polity: Indian federalism.

Example: Education, moved from the State List to the Concurrent List by the 42nd Amendment in 1976.

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three levels of biodiversity

The three levels of biodiversity are genetic diversity (variation within a species), species diversity (variety of species in a region), and ecosystem diversity (variety of habitats and ecological communities), the standard classification used under the Convention on Biological Diversity. All three are needed for a full measure of biological variety, from gene pools to landscapes.

Example: The Western Ghats, with its endemic species, distinct forest types and locally adapted crop varieties, is cited as a hotspot rich at all three levels.

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Three markets

The three markets are the product market (goods and services), the factor market (land, labour, and capital), and the financial market (money and credit): the three arenas where an economy's exchanges take place. Policy moves ripple across all three, since an interest-rate cut, for example, works through financial markets into product demand and factor employment. The framework is useful for structuring GS-3 economy answers.

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three subjects: defence, external affairs and communications

These are the three subjects that princely states ceded to India under the 1947 Instrument of Accession, modelled on the Government of India Act, 1935. Accession transferred only defence, external affairs, and communications, leaving rulers internal autonomy until full integration. It serves GS1 modern history: the integration of the princely states.

Example: Maharaja Hari Singh's Instrument of Accession for Jammu and Kashmir, signed on 26 October 1947.

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Three-Language Formula

The Three-Language Formula is the language policy recommended by the Kothari Commission and adopted in the National Policy on Education, 1968, then reiterated in 1986. Hindi-speaking states teach Hindi, English, and a modern Indian language, while non-Hindi states teach the regional language, Hindi, and English. It seeks to balance national integration with linguistic diversity, and it is a recurring GS-2 education question.

Example: the National Education Policy 2020, which retains the formula

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three-parent baby

A three-parent baby is a child born through mitochondrial donation treatment, carrying nuclear DNA from the mother and father plus a small amount of mitochondrial DNA, about 37 genes, from a female donor.

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three-stage nuclear power programme

India's three-stage nuclear power programme is the strategy formulated by Homi J. Bhabha in the 1950s to achieve long-term energy independence using the country's vast thorium reserves, about a quarter of the world's known thorium, despite its limited uranium. Stage one burns natural uranium in pressurised heavy water reactors, producing plutonium; stage two uses that plutonium in fast breeder reactors to breed fissile uranium-233 from thorium; stage three runs on thorium-based reactors for sustained power generation. Each stage manufactures the fuel for the next in a closed fuel cycle.

Example: The 500 MWe Prototype Fast Breeder Reactor at Kalpakkam, Tamil Nadu (stage two), whose core-loading was witnessed in March 2024, is the programme's current flagship milestone.

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three-stage plan

The three-stage plan is Homi Bhabha's strategy for Indian nuclear power: stage one uses pressurised heavy water reactors on natural uranium, stage two uses fast breeder reactors that generate plutonium, and stage three runs on thorium-derived uranium-233. It aims at long-term energy independence from India's vast thorium reserves. It serves GS3 science and technology: nuclear energy policy.

Example: The Prototype Fast Breeder Reactor at Kalpakkam, Tamil Nadu, the flagship of stage two.

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three-stage programme

The three-stage programme is shorthand for India's three-stage nuclear power programme, the Bhabha-designed strategy for energy independence based on the country's thorium reserves. It sequences natural-uranium reactors first, then plutonium-fuelled fast breeders, and finally thorium-based reactors, with each stage producing the fuel for the next. The closed fuel cycle design minimises nuclear waste while multiplying India's fissile material from limited uranium.

Example: The 500 MWe Prototype Fast Breeder Reactor at Kalpakkam, Tamil Nadu, whose core-loading was witnessed in March 2024, marks India's entry into the programme's second stage.

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three-tier

The three-tier system is India's structure of rural local government, recommended by the Balwant Rai Mehta Committee in 1957 and constitutionalised by the 73rd Amendment: the gram panchayat at the village level, the panchayat samiti at the block level, and the zila parishad at the district level. It serves GS2 polity: Panchayati Raj and democratic decentralisation.

Example: Rajasthan, the first state to adopt Panchayati Raj, inaugurated at Nagaur on 2 October 1959.

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three-tier Anand pattern

The three-tier Anand pattern is the cooperative dairy structure of village societies, district unions and a state federation, pioneered at Anand in Gujarat. Farmers own each tier, ensuring democratic control and fair prices from collection to marketing. For UPSC it is the institutional design replicated by Operation Flood nationwide.

Example: A village society pouring milk to its district union, which markets through the state federation, is the pattern in action.

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Three: map the stakeholders and their interests

Mapping the stakeholders and their interests is the third step of the standard ethical case-study method: after establishing the facts and the ethical issues, the administrator lists every affected party, citizens, colleagues, superiors, and herself, and notes what each stands to gain or lose. This mapping exposes hidden trade-offs and prevents one-sided decisions, and it is a core GS-4 technique for structured answers.

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thrown off a train at Pietermaritzburg

This is the June 1893 incident in which a young M.K. Gandhi, holding a first-class ticket in South Africa, was thrown off a train at Pietermaritzburg station for refusing to move to a third-class compartment. The humiliation pushed him into political activism against racial discrimination. It serves GS1 modern history: Gandhi's South Africa phase and the roots of satyagraha.

Example: The night of 7 June 1893 at Pietermaritzburg station in Natal, South Africa.

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Thuingaleng Muivah

Thuingaleng Muivah is the general secretary of the National Socialist Council of Nagaland (Isak-Muivah), the Naga insurgent group that signed the 2015 Framework Agreement with the Government of India. A Tangkhul Naga from Manipur's Ukhrul district, he has led the Naga peace talks for decades, with demands for Naga integration and a separate flag and constitution remaining sticking points. He is key to GS-3 internal-security questions.

Example: the Framework Agreement of 3 August 2015

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Thumba

Thumba is India's first rocket-launching station, the Thumba Equatorial Rocket Launching Station (TERLS) on the Kerala coast near Thiruvananthapuram. Lying close to the magnetic equator, it was ideal for sounding-rocket experiments, and its first launch, a Nike-Apache on 21 November 1963, marks the birth of the Indian space programme. For UPSC prelims, Thumba is the classic 'cradle of ISRO' fact, and in mains it anchors the story of India's space institutions.

Example: the Nike-Apache launch of 21 November 1963

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Thumba Equatorial Rocket Launching Station (TERLS)

The Thumba Equatorial Rocket Launching Station, established on 21 November 1963 at Thumba near Thiruvananthapuram in Kerala, is India's first rocket launching facility. It was chosen for its proximity to the Earth's magnetic equator, ideal for ionospheric studies and sounding-rocket launches, and its first launch was a US-built Nike-Apache sounding rocket. The station later grew into the Vikram Sarabhai Space Centre and was dedicated to the United Nations in 1968.

Example: India's indigenous Rohini series of sounding rockets, first flown from Thumba in the late 1960s.

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Thumba, Kerala

Thumba, Kerala is the fishing village on the Arabian Sea coast near Thiruvananthapuram that hosts India's first rocket-launching station. Its St. Mary Magdalene's Church and the bishop's house were handed over to the fledgling space programme, the prayer hall becoming its first office, and the site today anchors the Vikram Sarabhai Space Centre. For UPSC, Thumba illustrates the humble, community-backed origins of the Indian space programme.

Example: the space programme's first office in St. Mary Magdalene's Church

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Thumri

Thumri is a semi-classical vocal form of Hindustani music, lyrical and deeply emotive, that flowered in the courts of Lucknow and Varanasi in the eighteenth and nineteenth centuries. Its texts dwell on love and devotion, often in Brajbhasha, and its hallmark is delicate ornamentation and expressive improvisation, with Poorab and Punjabi styles. For UPSC art-and-culture, thumri sits beside khyal, dhrupad and tappa, and its Banaras and Lucknow roots are recurring prelims facts.

Example: Girija Devi, the celebrated Banaras thumri vocalist

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Tibetan Plateau

The Tibetan Plateau is the world's largest and highest plateau, averaging over 4,500 metres and spanning the Tibetan region of China, often called the Roof of the World and the Third Pole. It is the source of Asia's great rivers, including the Brahmaputra, Indus, Mekong and Yangtze, and its glaciers and snowfields regulate the Asian monsoon. For UPSC, it matters in geography for plateau formation and river systems, and in GS-2 for China, water security and Himalayan border disputes.

Example: the Brahmaputra (Yarlung Tsangpo) rising on the plateau

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Tiering

Tiering is the linking of assessment levels so that strategic assessments inform project assessments and project findings feed back into plans. It prevents every project EIA from restarting baseline and alternatives analysis from zero.

Example: Project terms of reference drawn from a completed river-basin SEA.

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TIES

TIES is the Trade Infrastructure for Export Scheme, launched by the Ministry of Commerce and Industry in March 2017. It replaced the delinked ASIDE scheme to help central and state agencies build export infrastructure such as border haats, land customs stations, testing labs, cold chains, and trade promotion centres, with central grant-in-aid normally capped at 50 percent of project equity. For UPSC, it is a standard GS-3 prelims scheme on export promotion and logistics.

Example: launched 15 March 2017

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tiger reserves

Tiger reserves are protected areas notified under the Wildlife (Protection) Act, 1972 to conserve tigers under Project Tiger, launched in 1973. Each has a core critical tiger habitat plus a buffer zone, managed through a Tiger Conservation Plan under the National Tiger Conservation Authority. It serves GS3 environment: wildlife conservation and protected-area networks.

Example: Madhav National Park in Madhya Pradesh, notified as India's 58th tiger reserve in March 2025.

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Tilak was prosecuted for sedition in 1897

Bal Gangadhar Tilak's prosecution for sedition in 1897 was his first trial under Section 124A of the IPC, charged over Kesari articles on Shivaji and the Chapekar brothers' killing of Plague Commissioner Rand at Poona. Tried at Bombay, with Justice Strachey defining 'disaffection' for the jury, he was sentenced to eighteen months of rigorous imprisonment. For UPSC, the case marks the colonial state's use of sedition law against the press and Tilak's emergence as a national martyr-figure.

Example: the Chapekar brothers' assassination of W.C. Rand in 1897

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Tilak was tried for sedition and transported to Mandalay

Tilak's trial for sedition and transportation to Mandalay refers to his 1908 conviction after Kesari editorials defending the Muzaffarpur bombing by Khudiram Bose were judged seditious. Justice Davar sentenced him to six years' transportation in Mandalay jail, Burma. There he wrote Gita Rahasya, his celebrated commentary on the Bhagavad Gita, and his release in 1914 revived nationalist politics. For UPSC, the episode shows the colonial crackdown on extremism after the Surat Split and the making of Tilak's all-India stature.

Example: Khudiram Bose's Muzaffarpur bombing of 1908

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Tilak's departure

Tilak's departure refers to his sailing to England in September 1918 to fight a libel suit against Valentine Chirol, author of 'Indian Unrest'. His absence left the Home Rule League leaderless at a critical moment, and with the Montagu-Chelmsford reforms dividing nationalists and Gandhi's appeal rising, the movement fizzled out by 1919. For UPSC, 'Tilak's departure to England' is the textbook explanation for the decline of the Home Rule Movement, often asked alongside Besant's indecision.

Example: the libel suit against Valentine Chirol, 1918

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Tilak's Kesari

Kesari, meaning 'lion', is the Marathi weekly Bal Gangadhar Tilak founded at Poona in 1881 with Gopal Ganesh Agarkar, alongside the English Mahratta. It became the voice of extremist nationalism, popularising the Shivaji and Ganapati festivals and the cry 'Swaraj is my birthright', and its fiery editorials repeatedly drew sedition charges in 1897 and 1908. For UPSC, Kesari exemplifies the nationalist press as a mass-mobilisation tool, and its founding year is a standard prelims fact.

Example: the newspaper's first issue at Poona on 4 January 1881

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Tilak's league

Tilak's league is the Home Rule League he founded at Belgaum in April 1916, during the First World War, to demand self-government for India on the Irish model. Headquartered at Poona, it built branches across Maharashtra, the Central Provinces, Karnataka and Berar and ran the first sustained mass campaign of the war years. For UPSC, it bridges the Surat Split and the Gandhian era; it is asked together with Annie Besant's parallel league of September 1916 and the Lucknow Pact.

Example: the Lucknow Pact of 1916

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time-bound, creditor-driven

A time-bound, creditor-driven process is how the Insolvency and Bankruptcy Code, 2016 resolves corporate failure: the Committee of Creditors, not the defaulting promoter, steers the resolution, and the process must close within 330 days or the company goes into liquidation. It serves GS3 economy: insolvency law and ease of doing business.

Example: The Bhushan Steel resolution, with Tata Steel's bid approved by the NCLT in May 2018.

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Time-space compression

Time-space compression is the concept, popularised by geographer David Harvey, that better transport and communication shrink effective distances and speed up economic and social life. Railways, the telegraph, air travel and now the internet have steadily collapsed how long it takes people, goods and ideas to move. For UPSC geography, it frames globalisation, urbanisation and the digital economy, and in mains it helps explain supply-chain integration and the rise of just-in-time production.

Example: the opening of the Suez Canal in 1869

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Timur

Timur (1336-1405), known in the West as Tamerlane, is the Turco-Mongol conqueror who built a vast empire centred on Samarkand, stretching across Persia and Central Asia. Claiming the legacy of Genghis Khan, he fused nomadic cavalry warfare with siege craft and deliberate terror, leaving pyramids of skulls after victories. For UPSC medieval history, Timur matters above all for his invasion of India in 1398-99, which shattered the Delhi Sultanate under the later Tughlaqs.

Example: the sack of Delhi in December 1398

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Timur's invasion

Timur's invasion is the 1398-99 raid on India by the Central Asian conqueror, who entered through the north-west passes, routed the Tughlaq army outside Delhi and sacked the city with mass slaughter and plunder. He withdrew within months, leaving Khizr Khan as his deputy. For UPSC, the invasion marks the collapse of Tughlaq authority and the prelude to the Sayyid dynasty, and it is a classic prelims question on the chronology of the Delhi Sultanate.

Example: Khizr Khan, left as Timur's deputy in 1399

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tin buttons

Tin buttons refers to the popular theory that Napoleon's 1812 Russian campaign collapsed partly because his soldiers' tin buttons disintegrated in the extreme cold, tin pest turning them to powder. Whether or not it decided the campaign, the essay uses it as the perfect small-cause-big-effect anecdote. It is the article's emblem of contingency in history.

Example: The theory that disintegrating tin buttons helped doom Napoleon's 1812 retreat from Russia.

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tinai

Tinai is the Sangam literary concept of five ecological landscapes, each linked to a mood and a way of life: kurinji (hills), mullai (forests), marutham (plains), neythal (coast), and palai (arid land). Tamil poets matched human emotion and occupation to landscape. It serves GS1 ancient history: Sangam age culture and literature.

Example: The Tolkappiyam's Porulatikaram, the Tamil grammar that codifies the five tinais.

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Tinais

Tinais (tinai) are the five ecological landscapes of ancient Tamilakam in Sangam literature: Kurinji (hills), Mullai (pastures and forests), Marutham (riverine plains), Neithal (coast) and Palai (arid tracts). Each tinai is assigned a presiding deity, flora, fauna, occupation and poetic mood under the akam and puram conventions. For UPSC, the tinai system is evidence of Sangam-age ecological and geographical awareness, and matching landscapes to deities is a staple art-and-culture prelims question.

Example: Murugan as the deity of the Kurinji hills

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tinkathia

Tinkathia was the oppressive system in Champaran, Bihar, under which European indigo planters forced ryots to cultivate indigo on three-twentieths (about 15 percent) of their holdings for the planter's benefit. When synthetic dyes collapsed indigo prices, planters imposed illegal levies instead of releasing the land. It matters for UPSC as the immediate trigger of Gandhi's first satyagraha on Indian soil.

Example: Gandhi's Champaran Satyagraha of 1917 investigated tinkathia; the planters agreed to refund 25 percent of the money they had illegally extracted, and the system was abolished.

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tinkathia system

The tinkathia system was the colonial indigo planters' practice in Champaran, Bihar, forcing peasants to grow indigo on three-twentieths (tinkathia) of their land at fixed low prices. Planters kept extorting illegal enhancements even after synthetic indigo destroyed demand. It serves GS1 modern history: peasant movements and the Champaran Satyagraha.

Example: Gandhi's Champaran Satyagraha of 1917, his first satyagraha in India.

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Tipayadal

Tipayadal is the Tamil fire-jumping ritual in which devotees cross a bed of burning embers as an act of devotion, usually in honour of Draupadi Amman or Mariamman. Performed at the climax of village festivals after fasting and prayer, it is believed to demonstrate the devotee's faith and purity. For UPSC art-and-culture, it belongs to Tamil folk religion; it also shows how the Mahabharata lives on in local ritual, a point usable in mains answers on living traditions.

Example: the Theemidhi fire-walking festival at Draupadi Amman temples in Tamil Nadu

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tipping point

In climate science, a tipping point is a threshold beyond which a climate subsystem shifts abruptly and often irreversibly into a new state. Crossing it triggers self-reinforcing feedbacks: for example, melting permafrost releases methane, which causes more warming and more melting. The concept matters for policy because it means gradual warming can produce sudden, large-scale changes.

Example: The potential collapse of the West Antarctic Ice Sheet, which could commit the world to several metres of sea-level rise even if emissions stopped.

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tipping points

Tipping points are the multiple thresholds across Earth's climate subsystems, ice sheets, ocean circulation, rainforests, and permafrost, beyond which abrupt and often irreversible shifts occur. Scientists track these interacting tipping elements because crossing one can raise the odds of crossing others, producing a cascade. Keeping warming well below 2 degrees C is framed partly as avoiding these thresholds.

Example: Earth system scientists list tipping elements such as the Greenland and West Antarctic ice sheets, the Atlantic Meridional Overturning Circulation (AMOC), the Amazon rainforest, and Arctic permafrost.

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Tipu Shah

Tipu Shah is the son and successor of Karam Shah who turned the Pagal Panthi sect into an armed peasant movement in Mymensingh district of Bengal in the 1820s. Mobilising Hajong and Garo tribal peasants against zamindari oppression and Company taxes, he captured Sherpur in 1825 and ran a parallel administration until his arrest in 1833; he died in 1852. For UPSC, the Pagal Panthis are a key pre-1857 peasant revolt, blending syncretic faith with agrarian resistance.

Example: the capture of Sherpur in 1825

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Tipu Sultan

Tipu Sultan (1751-1799) is the ruler of Mysore who succeeded Hyder Ali in 1782 and modernised the kingdom with a standing army, state trading, sericulture and rocket artillery. An unyielding foe of the British, he fought the Second, Third and Fourth Anglo-Mysore Wars and died in the siege of Seringapatam in 1799. For UPSC, he anchors the Anglo-Mysore wars and the Subsidiary Alliance era, and the 'Tiger of Mysore' debate on his legacy is mains-ready material.

Example: his death at the siege of Seringapatam on 4 May 1799

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Tirthas

Tirthas (tirtha) are sacred pilgrimage places in Indian religious traditions, literally 'fords' where the devotee crosses from the mundane to the sacred. The term covers Hindu dhams and kshetras, Jain and Buddhist pilgrimage centres, and in the Arthashastra it denotes the eighteen departments of the state. For UPSC, tirthas connect geography (river confluences, hill shrines) with art-and-culture (temple architecture, yatras) and ancient polity, making them a versatile prelims and mains theme.

Example: the Char Dham circuit (Badrinath, Dwarka, Puri, Rameswaram)

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Tirumurai

The Tirumurai is the twelve-volume Tamil Shaivite canonical collection, compiled around the 10th century, containing the devotional hymns (Tevaram) of the Nayanar saints Appar, Sundarar, and Sambandar, among others. Sung in temples to this day, it made bhakti accessible in Tamil and shaped South Indian religious life. For UPSC, it is central to the Bhakti movement and Tamil literature.

Example: Sambandar's Tevaram hymns within the Tirumurai, still sung in Shiva temples across Tamil Nadu.

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Tirupati and Lairai Devi (2025)

The Tirupati and Lairai Devi incidents of 2025 were crowd crushes at religious gatherings: the Tirupati temple token-queue stampede in January 2025 killed six devotees, and the Lairai Devi temple crush in Goa during the annual festival killed several more.

Example: both exposed the dangers of unmanaged queues at shrines

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Tiruvalluvar's Tirukkural

The Tirukkural is the classical Tamil text of 1,330 couplets in 133 chapters attributed to the poet-philosopher Tiruvalluvar, dated to the early centuries CE. Organised into virtue (aram), wealth (porul) and love (inbam), it distils ethics, statecraft and conduct in terse venpa verse. For UPSC, it is the flagship of post-Sangam Tamil literature and a cited authority on ancient Indian political thought, often paired with Kautilya's Arthashastra in mains answers.

Example: Tiruvalluvar Day, observed during the Pongal festival in Tamil Nadu

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Tiruvasagam

The Tiruvasagam is the collection of Tamil Shaivite devotional hymns composed by the saint-poet Manikkavacakar in the ninth century CE, forming the eighth book of the Tirumurai canon. Its passionate, personal verses addressed to Shiva earned it the title of the Tamil Veda of the Nayanmar tradition, and they are sung in temples to this day. For UPSC, it anchors the Tamil origins of the Bhakti movement and the Nayanmar-Alvar chapter of art-and-culture.

Example: Manikkavacakar, the 9th-century Nayanmar saint

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TISCO

TISCO is the Tata Iron and Steel Company, founded in 1907 by Jamsetji Tata at Sakchi (renamed Jamshedpur), now known as Tata Steel. It was India's first large-scale private steel plant and a landmark of the Swadeshi-era industrialization drive, producing steel for railways and later for nation-building projects. For UPSC, it anchors GS-1 and GS-3 themes of early Indian industrialization, Parsi entrepreneurship, and the growth of Jamshedpur as an industrial city.

Example: founded 1907 at Sakchi (Jamshedpur)

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Titanium dioxide nanoparticles

Titanium dioxide nanoparticles are engineered particles of TiO2 smaller than 100 nanometres, valued for their strong ultraviolet absorption and whitening power. They are widely used in sunscreens, paints, coatings and self-cleaning surfaces, and were formerly used as the food colour E171 until the European Union banned it in 2022 over genotoxicity concerns. Their tiny size gives them useful optical properties but also raises questions about inhalation and environmental exposure.

Example: Mineral sunscreens that rely on nano titanium dioxide to block UV rays while remaining transparent on the skin.

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Tithi Bhojan

Tithi Bhojan is a community-participation initiative under the school mid-day meal programme, now PM POSHAN, in which individuals or groups voluntarily serve special nutritious food to children on occasions such as birthdays, festivals or anniversaries. Originating in Gujarat, it was adopted nationally to supplement the standard meal and build community ownership of the scheme.

Example: local donors serving festive meals in Gujarat's government schools

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Tiware dam

The Tiware dam was the small dam in Maharashtra's Ratnagiri district that breached in July 2019, flooding villages and killing about 19 people.

Example: the Tiware breach highlighted the neglect of small dams

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TMOPM

TMOPM (Technology Mission on Oilseeds, Pulses and Maize) is the 1986 technology mission, launched as the Technology Mission on Oilseeds and expanded to pulses, oil palm and maize, to cut import dependence through HYVs, better agronomy and price support. It drove the first self-sufficiency push in edible oils before import liberalisation eroded gains. For UPSC it is the original mission-mode intervention in oilseeds.

Example: Its coordinated push on mustard and groundnut in the late 1980s briefly made India nearly self-sufficient in edible oils.

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TNT

trinitrotoluene, the reference explosive; explosive power is measured in kilotons or megatons of TNT equivalent.

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tokamak

A tokamak is a doughnut-shaped (toroidal) magnetic-confinement device designed to contain plasma hot enough for nuclear fusion, using powerful magnetic coils to keep the plasma from touching the walls. It is the most researched design for achieving controlled fusion power. The international ITER project in southern France, in which India is a partner, is building the world's largest tokamak.

Example: ITER at Cadarache, France, being built by 35 countries including India, will be the largest tokamak ever constructed.

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token copper/brass coins

Token copper or brass coins were Muhammad bin Tughlaq's 14th-century experiment of issuing base-metal coins stamped at the value of silver tankas, modelled on the paper currency of Yuan China. Mass forgery by the public collapsed the scheme within a few years and forced withdrawal. It serves GS1 medieval history: Delhi Sultanate economic experiments.

Example: The token tankas issued from Delhi in 1329-30 CE and withdrawn after widespread counterfeiting.

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token currency

Token currency is money whose face value exceeds the worth of its material, circulating on state authority rather than intrinsic value. The classic Indian case is Muhammad bin Tughlaq's copper and brass tokens valued as silver tankas, which failed through mass counterfeiting. It serves GS1 medieval history and GS3 economy: money and monetary systems.

Example: The paper notes of Yuan-dynasty China, the precedent that Tughlaq's experiment is said to have imitated.

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tokenistic public participation

Tokenistic public participation is consultation that exists on paper but has no real influence on decisions, turning public hearings into a formality. In India's EIA process it typically means hearings held with poor notice, in remote locations, or in languages affected communities do not understand, so tribal and rural voices are recorded but not heard. It is repeatedly cited as a weakness of environmental clearance, alongside poor report quality and ignored cumulative impacts.

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Tolerance

Tolerance is the ethical disposition to accept differing beliefs, faiths, and practices without coercion or hostility. In the Indian constitutional context it underpins secularism, fraternity, and the fundamental duty in Article 51A(e) to promote harmony and the spirit of common brotherhood. For UPSC GS-4, it is a core value tested through questions on communal harmony, pluralism, and ethical governance.

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Tolkappiyam

The Tolkappiyam is the oldest surviving Tamil grammar, attributed to Tolkappiyar and traditionally assigned to the second Sangam. Written in verse, it has three books: Eluttatikaram on phonology, Collatikaram on morphology, and Porulatikaram on poetics and social life. For UPSC, it is the earliest literary source for ancient Tamil society and polity, including the tinai (landscape-based) classification of life.

Example: Its Porulatikaram describes the five tinais, such as kurinji (hills) and marutam (plains), linking landscape to occupation and love poetry.

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Tolkappiyar

Tolkappiyar is the legendary author of the Tolkappiyam, the oldest surviving Tamil grammatical and literary treatise, traditionally linked to the second Sangam. Its three books cover orthography and phonology (Ezhuttatikaram), morphology and syntax (Sollatikaram), and poetics with the tinai landscape conventions (Porulatikaram). For UPSC, the Tolkappiyam is the primary source on Sangam-age Tamil society, language and literary theory, and its dating is a recurring prelims question.

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toll-free helpline (14416)

The toll-free helpline 14416 is Tele-MANAS, the national tele-mental-health service of the Ministry of Health and Family Welfare. It gives free, confidential counselling through trained counsellors and mental-health professionals in multiple languages, alongside the 1-800-891-4416 line. It serves GS2 governance: health schemes and social justice.

Example: The National Tele Mental Health Programme, announced in the Union Budget 2022-23.

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Tolstoy Farm

Tolstoy Farm is the cooperative settlement Mahatma Gandhi established near Johannesburg in 1910 with the support of architect Hermann Kallenbach, named after Leo Tolstoy, whose writings on non-violence deeply influenced him. It housed satyagrahi families resisting South Africa's discriminatory laws, practising simple living, manual labour and self-reliance. For UPSC, it is a landmark of Gandhi's South African phase and the laboratory where satyagraha matured before his return to India in 1915.

Example: Hermann Kallenbach, the architect who helped fund it

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Tomaras

The Tomaras are the Rajput clan that ruled the Delhi region before the Chauhans, with Anangpal Tomar traditionally credited as the founder of Dhillika in the eighth century. They raised the Lal Kot fortifications and the Surajkund reservoir, and their later Gwalior branch, remembered for Man Singh's palaces, resisted the Delhi Sultans. For UPSC, the Tomaras anchor the early-medieval Rajput polity of the doab and recur in questions on the founders of Delhi.

Example: the Lal Kot fortifications in Delhi

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Tondi

Tondi is the ancient Pandya port on the west coast mentioned in Sangam literature and identified with the Tyndis of Greco-Roman accounts such as the Periplus of the Erythraean Sea. It served the pepper and spice trade with the Roman world, linking the Pandyas to Indian Ocean commerce. For UPSC, Tondi illustrates Sangam-age maritime trade and the west-coast port network alongside Muziris, and it is a ready prelims mapping question.

Example: its identification with Tyndis in the Periplus

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top-down approach

In nanotechnology, the top-down approach means fabricating nanoscale structures by carving down or etching larger blocks of material, for example using lithography to pattern silicon chips. It is the opposite of the bottom-up approach, which builds structures atom by atom or molecule by molecule. Top-down methods dominate the semiconductor industry but become harder and costlier as features shrink below a few nanometres.

Example: Photolithography in chip manufacturing, which etches circuit patterns onto silicon wafers, is the classic top-down nanofabrication technique.

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top-down from a single basalt cliff

This describes the Kailasa temple at Ellora, carved top-down from a single basalt cliff in the 8th century. Artisans cut downward from the top of the rock, excavating around the rising temple instead of building upward. It serves GS1 art and culture: rock-cut architecture and temple styles.

Example: The Kailasa temple (Cave 16) at Ellora, commissioned under the Rashtrakuta king Krishna I.

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top-down from a single cliff

Top-down carving from a single cliff is the rock-cut technique in which sculptors begin at the top of a rock face and cut downward, freeing the monument from the living rock. Its greatest Indian achievement is the Kailasa temple at Ellora, hewn from one basalt cliff. It serves GS1 art and culture: rock-cut architecture.

Example: Ellora's Cave 16, where the entire Kailasa temple complex was excavated downward out of the hillside.

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Tor

Tor, short for The Onion Router, is free software and a volunteer-run network that anonymises internet traffic by routing it through multiple encrypted relays. Each relay peels away one layer of encryption, so no single node knows both the origin and the destination of the traffic, protecting users from surveillance and censorship. The same anonymity also shields illicit marketplaces, which is why Tor is debated as both a privacy tool and a law-enforcement challenge.

Example: Journalists and whistleblowers using Tor to communicate securely and access blocked information in countries with heavy internet censorship.

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Toramana

Toramana is the Alchon Hun chief who invaded India in the late fifth and early sixth century CE, ruling over Punjab, Kashmir, Malwa and parts of central India. His Eran inscription records his authority, and his pressure strained the Gupta western frontier until Yasodharman of Malwa checked him. For UPSC, Toramana embodies the Huna invasions that hastened Gupta decline, and his son Mihirakula's cruelty is the standard contrast point in ancient-history answers.

Example: the Eran inscription recording his authority

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Torana

A torana is the ornamental arched gateway of Indian architecture, most famously the four carved gateways of the Great Stupa at Sanchi. Each is built of two upright pillars joined by three curving architraves, sculpted with Jataka tales, yakshas and Buddhist symbols that narrate the Buddha's life to pilgrims. For UPSC art-and-culture, the Sanchi toranas are the signature example of early Buddhist stone carving and narrative sculpture, and their Satavahana-era craftsmanship is a frequent prelims fact.

Example: the four gateways of the Sanchi Stupa

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tornado

A tornado is a violently rotating column of air stretching from a thunderstorm cloud to the ground, with winds that can cross 300 km per hour along a narrow, destructive path. In India they form mainly from pre-monsoon severe storms in the east and northeast. It serves GS1 physical geography and GS3 disaster management: extreme weather events.

Example: The Jalpaiguri tornado of 31 March 2024 in West Bengal, which killed five people and injured over a hundred.

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Total Factor Productivity (TFP)

Total Factor Productivity (TFP) is the share of output growth not explained by increases in measured inputs like labour and capital. It captures efficiency gains from technology, better management, institutions and innovation, and in growth accounting it appears as the Solow residual: producing more from the same inputs. For UPSC GS-3, TFP explains why reforms, research and skilling matter beyond capital accumulation, and it features in Economic Survey discussions of India's growth drivers.

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total fertility rate

The total fertility rate is the average number of children a woman would bear in her lifetime at current age-specific birth rates. India's TFR fell to 2.0 in NFHS-5 (2019-21), below the 2.1 replacement level, signalling an advanced demographic transition. It serves GS1 society: population studies and demographics.

Example: NFHS-5 (2019-21), which recorded India's total fertility rate at 2.0 children per woman.

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total fertility rate (TFR)

Total fertility rate (TFR) is the average number of children a woman would have over her lifetime if she experienced current age-specific fertility rates throughout. A TFR of 2.1 is replacement level; India at 2.0 in NFHS-5 sits below it, though states vary widely. It serves GS1 society: demographics and population policy.

Example: Bihar's TFR of 3.0 in NFHS-5, the highest among major Indian states.

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Total installed capacity

Total installed capacity is the maximum rated electricity generation capacity connected to a grid, measured in megawatts or gigawatts and summed across all sources. It is a headline indicator of a power sector's scale and of progress in the energy transition, though actual generation is always lower because plants rarely run at full output. Analysts pair it with capacity utilisation and generation mix to judge real energy security.

Example: India's total installed power capacity of over 470 GW, with a national target of 500 GW of non-fossil capacity by 2030.

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Total Revolution

Total Revolution (Sampoorna Kranti) is the movement Jayaprakash Narayan launched in 1974-75 calling for a sevenfold transformation of Indian society across politics, economy, education, culture and morality. Born of the Bihar and Gujarat student agitations against corruption and price rise, it demanded the dismissal of the Bihar assembly and a moral regeneration of public life. For UPSC, it is the ideological backdrop to the 1975 Emergency; JP's 5 June 1974 Patna rally is a landmark date.

Example: JP's 5 June 1974 rally at Patna

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Total Revolution (Sampoorna Kranti)

Total Revolution (Sampoorna Kranti) is Jayaprakash Narayan's 1974 call for a 'total' transformation of India, seven revolutions spanning the political, economic, social, educational, cultural, ideological and moral spheres. Launched from the Bihar student movement under the Chhatra Sangharsh Samiti, it mobilised mass satyagraha against misrule and corruption. For UPSC, the movement explains the political crisis behind Indira Gandhi's Emergency proclamation of 25 June 1975 and JP's status as Loknayak.

Example: the Chhatra Sangharsh Samiti of the Bihar student movement

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total war

Total war is a conflict in which a state mobilises its entire society and economy, erasing the line between combatants and civilians through conscription, industrial production, rationing, and propaganda. The World Wars are the classic cases. It serves GS1 world history: the changing nature of modern warfare.

Example: The Second World War (1939-45), with civilian bombing, rationing, and full industrial mobilisation.

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towards faster and more inclusive growth

'Towards Faster and More Inclusive Growth' was the theme of the Eleventh Five Year Plan (2007-2012), which targeted 9 per cent GDP growth while stressing poverty reduction, education, and health so that growth reached the poor. It marked the shift from growth alone to growth with equity. It serves GS3 economy: planning in India.

Example: The Eleventh Five Year Plan (2007-12), steered by Montek Singh Ahluwalia as Deputy Chairman of the Planning Commission.

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Tower

In UPSC art-and-culture, towers form a compact heritage cluster: victory towers like the Vijay Stambha at Chittorgarh, minarets like the Qutub Minar, Jain kirti stambhas, and the Parsi dakhma or 'Tower of Silence' where the dead are laid for excarnation. In temple architecture, the towering vimana or shikhara crowns the sanctum. For prelims, tower types test the ability to match monuments to patrons and faiths across Rajput, Indo-Islamic and Parsi traditions.

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town of temples

'Town of temples' is the popular epithet of Kanchipuram in Tamil Nadu, a former Pallava capital famed for its ancient Shiva and Vishnu temples and counted among Hinduism's seven sacred cities granting moksha. It serves GS1 art and culture: temple architecture and sacred geography.

Example: The Kailasanatha temple of Kanchipuram, built by the Pallava king Rajasimha I around 700-728 CE.

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Townshend Acts

The Townshend Acts are the 1767-68 British parliamentary measures that imposed duties on colonial American imports of tea, glass, paper, lead and paint, and set up a customs board to enforce them. Meant to assert Parliament's right to tax the colonies after the Stamp Act's repeal, they triggered boycotts, the Boston Massacre of 1770 and the slide toward revolution. For UPSC world history, they embody the taxation-without-representation grievance behind the American War of Independence.

Example: the Boston Massacre of 1770

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Toyota Mirai

The Toyota Mirai is a hydrogen fuel-cell electric vehicle first launched by Toyota in 2014 that runs on compressed hydrogen and emits only water vapour from its tailpipe. It converts hydrogen into electricity in an onboard fuel cell to drive an electric motor, making it one of the flagship examples of hydrogen mobility worldwide. Its second generation, launched in 2020, offers a driving range of roughly 650 km on a full tank.

Example: Japan's deployment of Mirai fleets for government and taxi use as a showcase of its hydrogen society strategy.

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TPDS

The Targeted Public Distribution System is the 1997 revamp of the PDS that divided households into APL, BPL and Antyodaya categories with differential issue prices. It was subsumed under the National Food Security Act, 2013, which created Priority Household and Antyodaya entitlements. Leakages, Aadhaar seeding and e-PoS authentication keep it central to food-security reform debates. Example: e-PoS machines with Aadhaar authentication at fair price shops.

Example: e-PoS machines with Aadhaar authentication at fair price shops

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trabeate

Trabeate is the post-and-lintel style of construction, in which vertical pillars carry horizontal beams without any true arch. It characterises early Indian stone architecture, and early Sultanate builders used the related corbelled technique before the true arch became standard. It serves GS1 art and culture: architectural styles.

Example: The corbelled arches of the Quwwat-ul-Islam mosque at Delhi's Qutb complex, built in the trabeate tradition.

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trade

Trade is the exchange of goods and services between people, regions, or nations, recorded in India's balance of payments through merchandise and services exports and imports. It underpins GS3 economy topics from trade deficits and the current account to WTO negotiations and free trade agreements.

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trade account

The trade account is the part of the current account in the balance of payments that records exports and imports of goods, whose difference gives the trade balance or trade deficit. A deficit means the country imports more merchandise than it exports. It serves GS3 economy: the external sector and balance of payments.

Example: India's persistent merchandise trade deficit with China, driven by electronics and machinery imports.

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Trade and Technology Council

A Trade and Technology Council is a high-level bilateral forum where partner governments align policy on trade, trusted technology, and security, typically through ministerial meetings and working groups on strategic technologies, clean energy, and resilient supply chains. For UPSC, the India-EU TTC is India's first such forum and a marker of technology-driven strategic convergence amid supply-chain diversification away from China.

Example: The first India-EU TTC ministerial in Brussels in May 2023, which advanced semiconductor and clean-energy cooperation.

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Trade Disputes Act

The Trade Disputes Act of 1929 is the British Indian law enacted after the 1928 Bombay textile strikes, providing for Courts of Inquiry and Boards of Conciliation to settle industrial disputes. It banned sympathetic strikes and strikes or lockouts without notice in public utility services, curbing militant unionism. For UPSC, it marks the colonial state's first systematic industrial-relations framework and belongs to the Meerut Conspiracy Case era of labour unrest.

Example: the 1928 Bombay textile general strike

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Trade Facilitation Agreement

The Trade Facilitation Agreement is the WTO pact concluded at the 2013 Bali Ministerial Conference and in force since February 2017, the first multilateral deal since the WTO's founding. It commits members to simplify customs procedures, cut red tape and speed goods across borders, with special and differential treatment for developing countries. For UPSC GS-3, it is central to India's trade-policy and ease-of-doing-business debates; India's 2016 ratification is the linked prelims fact.

Example: the Bali Ministerial Conference of December 2013

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Trade secret

A trade secret is confidential business information, such as a formula, process, design or customer list, that derives commercial value from being secret and is protected by the owner's reasonable efforts to keep it so. Unlike patents, trade secrets need no registration and have no fixed term, but protection evaporates if the secret is independently discovered or reverse-engineered. Indian law protects them mainly through contracts and breach-of-confidence actions.

Example: The Coca-Cola recipe, guarded as a trade secret for well over a century instead of being patented.

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trade unions

Trade unions are voluntary associations of workers formed to bargain collectively with employers over wages, hours and working conditions, and to represent labour politically. In India they are registered under the Trade Unions Act of 1926 and are now governed by the Industrial Relations Code, 2020, one of the four labour codes. For UPSC they connect the freedom movement's labour history with contemporary questions on labour reform, strikes and the informal workforce.

Example: The All India Trade Union Congress, founded in 1920 as India's first central trade union organisation.

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Trade War

A trade war is an escalating cycle of tariffs, quotas and other protectionist measures by which countries penalise each other's exports instead of settling disputes through the WTO. Tariffs are the signature weapon, but modern trade wars also use export controls, sanctions and investment screening. For UPSC GS-3 and IR, trade wars reshape supply chains, commodity prices and India's export strategy, and they test the relevance of the multilateral trading system in mains answers.

Example: the US-China tariff escalation of 2018-19

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Trade-defence instruments are

Trade-defence instruments are the WTO-permitted remedies a country uses against unfair or surging imports: anti-dumping duties against goods sold below normal value, countervailing duties against subsidised imports, and safeguard measures offering temporary relief from import surges. In India they are administered through the Directorate General of Trade Remedies. For UPSC GS-3, they are the legal core of questions on protection against dumping and the Atmanirbhar debate on shielding domestic industry.

Example: India's safeguard duty on solar-cell imports in 2018

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Trademark

A trademark is a distinctive sign, word, logo, shape, colour or sound that identifies a business's goods or services and distinguishes them from competitors. Registered under India's Trade Marks Act of 1999, it gives the owner exclusive rights for renewable ten-year terms and can be enforced against infringement and passing off. Trademarks protect brand identity and consumer trust in the marketplace.

Example: Registered brand marks such as the Amul girl logo or the Tata wordmark.

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Traditional Knowledge Digital Library (TKDL)

The Traditional Knowledge Digital Library is an Indian digital database that documents traditional knowledge, especially Ayurveda, Unani, Siddha and Yoga formulations, in structured formats that patent examiners worldwide can search. Built by CSIR with the AYUSH ministry, it blocks erroneous patents on Indian traditional medicine by establishing prior art, and access agreements have been signed with major patent offices. It is a pioneering defensive-protection tool for traditional knowledge.

Example: The 1997 revocation of a US patent on turmeric's wound-healing properties, the case that motivated TKDL's creation.

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Traditional media

Traditional media comprises newspapers, television, radio and cinema, operating through editorial gatekeeping and broadcast regulation. For internal security it is both a force multiplier for awareness and a risk when sensationalism aids terrorists or panics the public. Regulation flows from the Press Council, the Cable TV Act and Article 19(2).

Example: Television coverage shaping public response during 26/11

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traditional medicine

Traditional medicine is the body of health practices, knowledge, and beliefs based on the theories and experiences of indigenous cultures, used to maintain health and treat illness. India's systems include Ayurveda, Yoga, Unani, Siddha, and Homoeopathy, collectively known as AYUSH, which rely largely on plant-based formulations. WHO recognises traditional medicine's role in primary health care, and India has pushed for its scientific validation and global standardisation.

Example: The Traditional Knowledge Digital Library (TKDL) documents Indian medicinal formulations to prevent biopiracy, and it was used to get a US patent on turmeric's wound-healing use revoked.

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TRAI

TRAI, the Telecom Regulatory Authority of India, is the statutory regulator for telecom services set up under the TRAI Act, 1997. It regulates tariffs, interconnection and quality of service, protects consumer interests and curbs unsolicited commercial communication, while the TDSAT adjudicates disputes. It is central to digital regulation debates. Example: TRAI's tariff and interconnection orders for the broadcasting sector.

Example: TRAI's tariff and interconnection orders for the broadcasting sector

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TRAI (Amendment) Act, 2000

The TRAI (Amendment) Act, 2000 restructured telecom regulation by creating the Telecom Disputes Settlement and Appellate Tribunal and reconstituting TRAI with a chairperson, two whole-time and two part-time members. It separated regulation from adjudication and barred the TRAI chairperson from government employment after tenure. It is cited in regulatory design and tribunalisation debates. Example: operator disputes going to TDSAT rather than TRAI.

Example: operator disputes going to TDSAT rather than TRAI

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TRAI Act

The TRAI Act is the Telecom Regulatory Authority of India Act, 1997, the statute that created India's telecom regulator. It empowers TRAI to regulate tariffs, interconnection and service quality and protect consumer interests, with the 2000 amendment adding the TDSAT for dispute adjudication. It underpins the regulatory framework of India's telecom sector. Example: TRAI's quality-of-service regulations for mobile networks.

Example: TRAI's quality-of-service regulations for mobile networks

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TRAI Act, 1997

The TRAI Act, 1997 is the founding statute of the Telecom Regulatory Authority of India, enacted as telecom opened to private competition. It gave TRAI powers over tariffs, licensing terms and consumer protection, later refined by the 2000 amendment that created the TDSAT. It marks India's shift to independent sectoral regulation. Example: TRAI's constitution in 1997 as the telecom watchdog.

Example: TRAI's constitution in 1997 as the telecom watchdog

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TRAI's spam-control framework

TRAI's spam-control framework is the Telecom Regulatory Authority of India's system for curbing unsolicited commercial communication (UCC). It uses blockchain-based distributed ledger technology (DLT) to register telemarketers and verify message headers and templates, with 2024 amendments requiring whitelisting of URLs and links in commercial SMS to fight fraud. For UPSC, it is a GS-2/GS-3 current-affairs case of technology-based regulation and consumer protection in digital governance.

Example: 2024 UCC amendments (DLT whitelisting)

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training and arms

Training and arms refers to the military equipment and training assistance the United States pledged to Pakistan under the Mutual Defense Assistance Agreement of May 1954, which set up the Military Assistance Advisory Group in Rawalpindi. It tilted the Cold War balance in South Asia and pushed India closer to the Soviet Union. It serves GS2 international relations: Cold War alignments.

Example: The US-Pakistan Mutual Defense Assistance Agreement signed on 19 May 1954.

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Training gaps

Training gaps are the mismatch between the skills and knowledge that personnel actually possess and what their roles demand. In UPSC's governance context the term appears in discussions of capacity building in public administration, where outdated training, weak domain expertise and poor alignment with field realities reduce the quality of service delivery. It matters for GS-2 answers on administrative reforms and for prelims questions on civil services capacity-building initiatives.

Example: Mission Karmayogi, launched in 2020, was designed to close capacity gaps through role-based training of civil servants

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Tranquebar in 1620

Tranquebar in 1620 marks the founding of Denmark's first settlement in India. That year Danish admiral Ove Gjedde signed a treaty with Raghunatha Nayak of Thanjavur, receiving the fishing village of Tharangambadi on the Coromandel Coast, where the Danes built Fort Dansborg, their trading headquarters until its sale to Britain in 1845. It is a classic prelims fact on European rivalries and the Danish East India Company in India.

Example: Fort Dansborg at Tharangambadi, Tamil Nadu, completed in 1620

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Trans fat

unsaturated fat artificially solidified by hydrogenation of liquid vegetable oils; it raises LDL and lowers HDL cholesterol, increasing heart-disease risk.

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Trans-Siberian Railway

The Trans-Siberian Railway is the world's longest railway line, running about 9,289 km from Moscow to Vladivostok across Russia. Built between 1891 and 1916, it links European Russia with the Pacific, carrying freight and passengers through Siberia's harsh terrain. For UPSC it appears in prelims geography as the classic transcontinental rail route and in mains answers contrasting connectivity projects such as the International North-South Transport Corridor.

Example: its completion in 1916 connected Moscow with the Pacific port of Vladivostok

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Transcontinental Railroad

The Transcontinental Railroad is the first railway line completed across the United States, joining the Union Pacific and Central Pacific lines in 1869. It shrank coast-to-coast travel from months to days, opened the American West to settlement and trade, and symbolized industrial-age nation-building. For UPSC it is useful in world history answers on industrialization and in geography questions on transcontinental transport corridors and their economic effects.

Example: the Golden Spike ceremony at Promontory Summit, Utah, in 1869

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transfer of power without Partition

Transfer of power without Partition was the Cabinet Mission Plan's core proposal of May 1946: a united India with a weak centre handling only defence, foreign affairs, and communications, provinces grouped into three sections, and no separate Pakistan. The Muslim League's rejection of the plan opened the road to Partition. It serves GS1 modern history: the road to independence.

Example: The Cabinet Mission's proposals announced on 16 May 1946 by Pethick-Lawrence, Cripps, and Alexander.

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transfer payments

Transfer payments are payments made with no goods or services received in return, such as pensions, scholarships, subsidies, and unemployment benefits. In the balance of payments they appear as secondary income, and in fiscal policy they redistribute income toward the vulnerable. It serves GS3 economy: public finance and national income accounting.

Example: PM-KISAN's income support of Rs 6,000 per year to land-holding farmer families.

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transferable

In UPSC usage, transferable most often qualifies the vote in the single transferable vote system used for Rajya Sabha and Presidential elections, where surplus and eliminated candidates' votes pass to voters' next preferences. Generally it means capable of being passed from one holder to another. It serves GS2 polity: electoral systems.

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transferable and non-hereditary

A transferable and non-hereditary jagir is a Mughal revenue assignment granted to a mansabdar that could be reassigned by the emperor and never passed to the holder's heirs, reverting to the state on death. This kept nobles dependent on imperial favour and blocked a hereditary landed aristocracy. It is a core GS-1 medieval history concept for Mughal administration and the mansabdari system.

Example: the jagir assignments documented in the Ain-i-Akbari

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transferable and rotated

A transferable and rotated jagir is a Mughal revenue grant subject to frequent reassignment among mansabdars, often every few years, to stop nobles building entrenched local power bases. Rotation prevented regional strongholds but encouraged short-term revenue squeezing that hurt peasants. It matters for GS-1 as a cause of the jagirdari crisis and agrarian distress behind later Mughal decline.

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transferred

Transferred subjects were the provincial departments placed under Indian ministers responsible to the elected legislature under the dyarchy introduced by the Government of India Act, 1919. They included education, health and agriculture, while reserved subjects stayed with the governor. The scheme is GS-2's first case study of responsible government in India and why the 1919 experiment failed.

Example: dyarchy operating in the provinces from 1921

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transferred or resumed

A jagir that could be transferred or resumed was a Mughal revenue assignment the emperor might reassign to another mansabdar or take back into khalisa, the crown lands, at will. This insecurity of tenure discouraged long-term investment in land and pushed nobles to extract maximum revenue quickly. It is asked in GS-1 for its link to the agrarian crisis behind Mughal decline.

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transferred provincial subject

A transferred provincial subject is a department of provincial government handed to ministers answerable to the elected legislature under the 1919 Act's dyarchy, such as education, public health, agriculture and local self-government. Reserved subjects like police and finance remained with the governor. The distinction is central to GS-2 questions on the Montagu-Chelmsford reforms and the failure of dyarchy.

Example: public health administered by Indian ministers in Bombay Presidency under dyarchy

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Transform

Transform, as a verb used in UPSC contexts, means to bring about a fundamental change in the structure or character of an economy, institution or society rather than incremental improvement. The term recurs in government programme names and in mains answers on reforms, where aspirants are expected to show how a policy transforms outcomes instead of merely tweaking them. It signals the difference between cosmetic change and structural reform in governance essays.

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transgender persons

Transgender persons are individuals whose gender identity differs from the sex assigned to them at birth, including trans-men, trans-women, and intersex persons. The Supreme Court in NALSA v. Union of India (2014) recognised them as a third gender entitled to equal fundamental rights, directing welfare measures and reservations. Parliament followed with the Transgender Persons (Protection of Rights) Act, 2019. Example: issuance of third-gender identity certificates by district magistrates.

Example: District magistrates issuing transgender identity certificates under the Transgender Persons (Protection of Rights) Act, 2019.

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Transgender Persons (Protection of Rights) Act, 2019

The Transgender Persons (Protection of Rights) Act, 2019 is India's first statute protecting transgender rights, prohibiting discrimination in education, employment, and healthcare. It grants a certificate of identity through the District Magistrate, creates a National Council for Transgender Persons, and punishes offences with six months to two years of imprisonment. For UPSC, it is the legislative sequel to the NALSA (2014) judgment and central to social-justice questions.

Example: The Supreme Court's NALSA v. Union of India (2014) ruling, which recognised transgender persons as a third gender.

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transgenesis

Transgenesis is the process of introducing a gene from one organism (the transgene) into the genome of another, producing a transgenic organism that carries and expresses the foreign gene. It is the core technique of genetic engineering, used to create insect-resistant Bt cotton, vitamin-A-enriched golden rice, and therapeutic proteins in animals. Transgenic organisms are regulated in India by the Genetic Engineering Appraisal Committee (GEAC).

Example: Bt cotton, which carries a gene from the bacterium Bacillus thuringiensis that makes the plant resistant to bollworm pests, is India's most widely grown transgenic crop.

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transistor

A transistor is a semiconductor device that can amplify or switch electronic signals, acting as the basic building block of all modern electronics. Invented at Bell Labs in 1947, it replaced bulky vacuum tubes and made miniaturisation possible. Billions of transistors are packed into each modern microprocessor, and shrinking their size, the trend known as Moore's law, drove decades of computing progress.

Example: A modern smartphone chip contains tens of billions of transistors on a piece of silicon a few centimetres across.

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transistors

Transistors are semiconductor switches that amplify and control electric current, and they are the fundamental building blocks of digital electronics. Every logic gate in a processor is built from transistors, so a chip's performance and power efficiency scale with how many transistors it holds and how small they are. The global race in semiconductors is largely a race to pack more transistors into each chip.

Example: Modern flagship processors contain tens of billions of transistors, each only a few nanometres wide.

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transmission

Transmission is the spread of ideas, technologies, artistic styles or beliefs from one society to another through trade, conquest, migration or missionary activity. It explains phenomena like Buddhist art travelling the Silk Road and the diffusion of iron technology. The concept underpins GS-1 art-and-culture and ancient history questions on cultural contact and diffusion.

Example: Gandhara art carrying Greco-Roman styles into Buddhist sculpture (1st-3rd century CE)

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transnational coalitions

Transnational coalitions are alliances of civil society groups, NGOs and movements across countries that coordinate campaigns on shared causes like climate action, human rights or debt relief. They use global media and international forums to pressure governments beyond any single border. They feature in GS-2 governance and GS-3 environment answers on civil society's role in global policymaking.

Example: civil society coalitions pressing for ambition at the 2015 Paris climate conference

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Transparency

Transparency is the ethical value of openness in decision-making: making the reasons, processes, and outcomes of public action visible and accessible to citizens. It rests on the idea that power exercised in the open is harder to abuse. For UPSC GS-4, transparency is paired with accountability as a foundational value of good governance, and it underpins the Right to Information framework.

Example: The RTI Act, 2005, which gives citizens the right to seek information from public authorities, is India's principal legal instrument of transparency.

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Transparency of Lobbying Act

The Transparency of Lobbying Act is the common short name for the United Kingdom's Transparency of Lobbying, Non-Party Campaigning and Trade Union Administration Act, 2014. It created a statutory register of consultant lobbyists, requiring those who lobby ministers or permanent secretaries on behalf of paying clients to declare themselves publicly. For UPSC, it is the leading international model cited in debates on regulating lobbying in India, where lobbying remains unregulated and opaque.

Example: Its consultant-lobbyist register is cited as a template for a proposed Indian law to regulate lobbying.

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transport costs

Transport costs are the expenses of moving goods and people, covering fuel, labour, infrastructure charges and time lost in transit. They shape industrial location, regional price differences and trade competitiveness, and high costs can isolate landlocked regions from markets. The concept anchors GS-1 geography and GS-3 economy answers on industrial location theory and logistics reform.

Example: the Dedicated Freight Corridor cutting rail freight costs between Delhi and Mumbai

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Trap alert

A trap alert is an early-warning signal generated by an automated monitoring device, most familiar in UPSC environment preparation as the camera-trap alert used in wildlife conservation. Camera traps photograph passing animals and can alert forest staff to poaching, human-wildlife conflict or the movement of tagged species. The concept matters for prelims questions on wildlife monitoring technology and for GS-3 answers on using technology in forest and biodiversity protection.

Example: camera traps deployed by the National Tiger Conservation Authority in the all-India tiger estimation exercise

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Travel for LiFE

Travel for LiFE is a Ministry of Tourism programme launched globally on World Tourism Day 2023 as the tourism sector's arm of Mission LiFE (Lifestyle for Environment). It nudges tourists and tourism businesses toward sustainable practices through 40 illustrative actions across eight themes, including saving energy and water, saying no to single-use plastic and respecting local culture, plus a certification scheme for tourism businesses. It aims to shift tourism from a use-and-dispose model to a circular, mindful one.

Example: The Travel for LiFE for Cleanliness vertical, a national campaign cleaning tourist sites and monuments in convergence with the Swachhata mission.

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Travellers

Travellers are the foreign visitors whose accounts serve as key sources for reconstructing ancient and medieval Indian history. Greek, Chinese, Arab and European travellers recorded court life, trade, religion and administration, from Megasthenes' Indica on the Mauryas to Al-Biruni's Kitab-ul-Hind and Ibn Battuta's Rihla on the Delhi Sultanate. For UPSC they are indispensable prelims material on historical sources and enrich mains answers with contemporary eyewitness evidence.

Example: Hiuen Tsang's Si-yu-ki describing 7th-century India under Harshavardhana

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Treasury bills

Treasury bills are short-term money market instruments issued by the Reserve Bank of India on behalf of the Government of India to meet temporary cash needs. Sold at a discount and redeemed at face value, they mature in 91, 182 or 364 days and are auctioned to banks and investors. They matter for UPSC as the basic instrument of government short-term borrowing, linking prelims economy questions with GS-3 topics on fiscal management and public debt.

Example: the RBI's weekly auction of 91-day treasury bills

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Treaties of Rome and the EEC (1957)

The Treaties of Rome, signed on 25 March 1957 and in force from 1958, created the European Economic Community and Euratom, extending the coal and steel pool into a full common market of the six founding states.

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Treating a plain wrong as a dilemma

Treating a plain wrong as a dilemma is an ethical reasoning error in which a clearly unethical act is presented as a difficult moral choice to evade judgment. By framing corruption, cruelty or dishonesty as a dilemma, the actor avoids accountability and normalizes wrongdoing. For UPSC GS-4 it is a useful concept when discussing moral courage and integrity, and how public servants should distinguish genuine dilemmas from plain violations of duty.

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Treating the middle path as automatically correct

Treating the middle path as automatically correct is the fallacy of assuming that a compromise between two positions must be the right answer, known in logic as the argument to moderation. In ethics, a middle course between a just and an unjust position can still be unjust, so the merit of each option must be examined independently. For UPSC GS-4 it sharpens answers on ethical decision-making and warns against lazy moral reasoning.

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treatment gap

The treatment gap is the share of people with an illness who need care but do not receive it, exceeding 80% for mental disorders in India according to the National Mental Health Survey of 2015-16. Stigma, few specialists and weak primary-care integration drive it. It is a recurring GS-2 health-governance data point for answers on mental healthcare and the District Mental Health Programme.

Example: the 83% treatment gap for mental disorders reported by India's National Mental Health Survey (2015-16)

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Treaty of Aix-la-Chapelle

The Treaty of Aix-la-Chapelle of 1748 ended the War of the Austrian Succession in Europe and, by extension, the First Carnatic War in India. Under its terms the French returned Madras, which Dupleix had captured in 1746, to the English in exchange for Louisbourg in North America. For UPSC it illustrates how European rivalries played out in India and marks the pause before the Anglo-French struggle resumed in the Second Carnatic War.

Example: Madras was restored to the English under its terms after its capture by Dupleix in 1746

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Treaty of Allahabad

The Treaty of Allahabad of 1765 was signed by Robert Clive with Mughal emperor Shah Alam II and the Nawab of Awadh after the Battle of Buxar. The emperor granted the Diwani of Bengal, Bihar and Orissa to the East India Company, while Awadh was restored to Shuja-ud-Daula. It created the Dual Government in Bengal and is a landmark in UPSC modern history as the legal beginning of British territorial revenue power in India.

Example: the grant of Diwani rights to the Company by Shah Alam II in 1765

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Treaty of Amritsar

The Treaty of Amritsar of 1809 was signed between Maharaja Ranjit Singh and the British, negotiated by Charles Metcalfe amid fears of a Franco-Russian threat to India. It fixed the Sutlej as the boundary of British possessions, with the British agreeing not to interfere in territories north of the river. For UPSC it is the classic prelims treaty on Anglo-Sikh relations and the foundation of Ranjit Singh's secure Punjab kingdom.

Example: Charles Metcalfe's mission to Ranjit Singh's court in 1809

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Treaty of Bassein

The Treaty of Bassein of 1802 was signed by Peshwa Baji Rao II, who accepted British subsidiary alliance terms after fleeing from the Holkars. He ceded territory for the upkeep of a British subsidiary force and surrendered control over foreign policy. The treaty gave the British a decisive foothold in Maratha politics and precipitated the Second Anglo-Maratha War, making it a staple of UPSC modern history.

Example: Baji Rao II signed it on 31 December 1802 after his defeat at Poona

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Treaty of Bhairowal

The Treaty of Bhairowal of December 1846 supplemented the Treaty of Lahore after the First Anglo-Sikh War. It placed a British Resident at Lahore with full authority over every department of the Sikh state, aided by a Council of Regency, while Maharani Jind Kaur was pensioned off. It effectively transferred Punjab's administration to the British and is important for UPSC as the step between the Treaty of Lahore and the annexation of Punjab in 1849.

Example: Henry Lawrence became the British Resident at Lahore under its terms

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Treaty of Brest-Litovsk

The Treaty of Brest-Litovsk of March 1918 is the separate peace by which Bolshevik Russia left the First World War, ceding vast western territories to Germany. Lenin bought survival of the revolution at the price of land; the treaty was annulled when Germany lost in the west.

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Treaty of Brest-Litovsk (March 1918)

The Treaty of Brest-Litovsk of March 1918 was the peace settlement between Soviet Russia and the Central Powers that took Russia out of the First World War. Russia surrendered Poland, Ukraine, the Baltic provinces and other territories, losing vast population and resources. The treaty was annulled after Germany's defeat later that year. For UPSC it is a key world-history fact on the Russian Revolution's consequences and wartime diplomacy.

Example: signed on 3 March 1918 between Soviet Russia and the Central Powers

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Treaty of Brest-Litovsk in March 1918

The Treaty of Brest-Litovsk signed in March 1918 ended Russia's participation in the First World War through a separate peace with the Central Powers. Under harsh terms the Bolshevik government ceded Ukraine, Poland, Finland and the Baltic lands to secure the survival of the revolution. It matters for UPSC world history as the event that freed German troops for the Western Front and showed the revolution's cost in territory.

Example: Russia ceded Ukraine and Poland under its terms

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Treaty of Lahore

The Treaty of Lahore of March 1846 ended the First Anglo-Sikh War after the British victory at Sobraon. The Sikhs ceded the Jullundur Doab, paid a large indemnity, reduced their army, and accepted a British Resident at Lahore, while Kashmir was then sold to Gulab Singh under the separate Treaty of Amritsar. It is a core UPSC prelims topic marking the beginning of the end of the Sikh Empire.

Example: Gulab Singh purchased Kashmir for 75 lakh rupees under the connected Treaty of Amritsar of 1846

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Treaty of Lausanne

The Treaty of Lausanne of 1923 was the peace settlement between Turkey and the Allied powers that replaced the unratified Treaty of Sevres. It recognized the sovereignty of the Turkish republic, fixed its modern borders, and ended the Ottoman Empire's partition. For UPSC world history it marks the triumph of Mustafa Kemal's nationalist movement and the birth of modern Turkey after the First World War.

Example: signed on 24 July 1923 at Lausanne, Switzerland

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Treaty of Madras

The Treaty of Madras of 1769 ended the First Anglo-Mysore War on the basis of status quo ante bellum, with both sides restoring conquests and promising mutual aid in defensive wars. Dictated by Hyder Ali at the gates of Madras, it humiliated the British and committed them to help Mysore against the Marathas, a promise they later broke. It is a standard UPSC prelims treaty on the Anglo-Mysore conflicts.

Example: Hyder Ali appeared with his army before Madras in 1769 to force its terms

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Treaty of Mangalore

The Treaty of Mangalore of 1784 ended the Second Anglo-Mysore War between Tipu Sultan and the British. Both sides agreed to mutual restitution of conquests and the release of prisoners, restoring the pre-war position. Signed after Tipu's successes against the British, it was the last treaty an Indian power dictated on equal terms. For UPSC it closes the Warren Hastings-era Mysore conflict in modern history.

Example: signed in March 1784 after Tipu Sultan's victories in the war

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Treaty of Paris

The Treaty of Paris most commonly denotes the 1783 settlement that ended the American Revolutionary War, with Britain recognizing the independence of the United States. An earlier Treaty of Paris of 1763 had ended the Seven Years' War, stripping France of Canada and restoring Pondicherry to France in India. Both matter for UPSC world history, the latter directly shaping the Anglo-French balance that enabled British supremacy in India.

Example: the 1783 treaty formally recognized the independence of the United States of America

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Treaty of Paris 1763

The Treaty of Paris of 1763 is the settlement ending the Seven Years War, by which France ceded Canada and its claims east of the Mississippi to Britain. It made Britain the leading colonial power and left France nursing the grievances that fed its support of American independence.

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Treaty of Paris 1783

The Treaty of Paris of 1783 is the settlement by which Britain recognised the independence of the United States, fixing its borders at the Mississippi and the Great Lakes. It closed the American Revolution and opened the republic's westward century.

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Treaty of Paris and the ECSC (1951)

The Treaty of Paris, signed on 18 April 1951 and in force from 1952, created the European Coal and Steel Community of six states, pooling coal and steel under a common High Authority: the first step of European integration.

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Treaty of Peace and Friendship

The Treaty of Peace and Friendship of 1950 between India and Nepal established an open border and reciprocal national treatment for citizens of both countries. Its provisions on security consultation and equal economic rights have drawn periodic Nepali demands for review, especially Articles 6 and 7. For UPSC it is central to India-Nepal relations in GS-2, linking neighbourhood policy, migration and sovereignty debates.

Example: signed on 31 July 1950 at Kathmandu

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Treaty of Peace, Friendship and Cooperation

The Treaty of Peace, Friendship and Cooperation of August 1971 was signed between India and the Soviet Union months before the Bangladesh liberation war. Its Article IX provided for mutual consultations in case of attack or threat, effectively deterring outside intervention during the conflict. For UPSC it is the landmark of Cold War-era Indian foreign policy and a staple of GS-2 answers on strategic autonomy and the Indo-Soviet partnership.

Example: signed on 9 August 1971 in New Delhi

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Treaty of Peace, Friendship and Cooperation (August 1971)

The Treaty of Peace, Friendship and Cooperation signed in August 1971 bound India and the Soviet Union in a twenty-year pact of mutual consultation and non-aggression. Concluded on the eve of the Bangladesh war, it signalled Soviet backing for India and neutralized the American-Chinese tilt toward Pakistan. It matters for UPSC as the diplomatic shield behind the 1971 victory and a case study in realist foreign policy.

Example: its Article IX committed both sides to consult each other if either faced attack or threat

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Treaty of Pondicherry

The Treaty of Pondicherry of 1754 ended the Second Carnatic War between the English and French East India Companies. Both sides renounced Indian titles and restored conquests, Muhammad Ali was recognized as Nawab of the Carnatic, and Dupleix was recalled to France in disgrace. For UPSC it marks the failure of Dupleix's imperial design and the turning point after which British influence steadily overtook French power in South India.

Example: Dupleix's recall to France followed the treaty's repudiation of his policies

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Treaty of Poona

The Treaty of Poona of 1817 was imposed on Peshwa Baji Rao II after the British exposed his hostility. He ceded large territories, renounced claims over the Gaekwad, and accepted British supremacy, effectively reducing the Peshwa to a pensioner. His subsequent revolt triggered the Third Anglo-Maratha War. For UPSC it is the treaty that sealed the Peshwa's subordination before the final Maratha defeat in 1818.

Example: signed in June 1817 between Baji Rao II and the East India Company

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Treaty of Purandar

The Treaty of Purandar is the 1665 settlement between Shivaji and the Mughal commander Mirza Raja Jai Singh I, acting for Aurangzeb. Shivaji surrendered 23 of his 35 forts and accepted Mughal suzerainty, while retaining 12 forts with an annual revenue arrangement. It is a classic UPSC modern-history data point: treaty, year, parties and terms are all asked, and it set the stage for Shivaji's 1666 visit to Agra.

Example: Treaty of Purandar, 1665

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Treaty of Salbai

The Treaty of Salbai of 1782 ended the First Anglo-Maratha War, restoring the status quo ante bellum with both sides returning conquests. Raghunathrao was pensioned off and the British recognized Madhavrao II as Peshwa, securing about two decades of peace with the Marathas. For UPSC it is the classic Warren Hastings-era treaty showing British failure to impose a puppet Peshwa and the limits of early Company power.

Example: signed on 17 May 1782 between the Company and the Marathas

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Treaty of Seringapatam

The Treaty of Seringapatam of 1792 ended the Third Anglo-Mysore War after Cornwallis besieged Tipu Sultan's capital. Tipu ceded half his territories to the British and their allies, paid an indemnity of about 3.3 crore rupees, and surrendered two of his sons as hostages. It halved Mysore's power and is a landmark UPSC prelims treaty in the sequence of Anglo-Mysore conflicts.

Example: Tipu's young sons were handed over as hostages to guarantee payment

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Treaty of Sèvres

The Treaty of Sevres of 1920 was the Allied peace imposed on the Ottoman Empire after the First World War, partitioning its Arab provinces and leaving Turkey a small rump state under foreign control. Turkish nationalists under Mustafa Kemal rejected it and, after winning the War of Independence, replaced it with the Treaty of Lausanne. For UPSC it explains the mandate system in West Asia and the birth of modern Turkey.

Example: Mustafa Kemal's nationalist movement rejected the treaty and fought to overturn it

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Treaty of St Germain

The Treaty of St Germain of 1919 was the peace settlement between Austria and the Allied powers after the First World War. It formally dissolved the Austro-Hungarian Empire's Austrian half, recognized the independence of Czechoslovakia, Poland and Yugoslavia, and imposed military and reparations restrictions. For UPSC world history it illustrates the principle of self-determination redrawing Europe's map after 1918.

Example: signed on 10 September 1919 at Saint-Germain-en-Laye, France

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Treaty of Surat

The Treaty of Surat of 1775 was signed between Raghunathrao and the Bombay Council of the East India Company. In exchange for British military help to make him Peshwa, Raghunathrao ceded Salsette and Bassein to the Company. The Calcutta Council disowned it, but the treaty's fallout led directly to the First Anglo-Maratha War. For UPSC it opens the standard sequence of Maratha treaties in modern history.

Example: Raghunathrao ceded Salsette and Bassein to the Bombay government

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Treaty of Trianon

The Treaty of Trianon of 1920 was the post-war settlement between Hungary and the Allied powers. It stripped Hungary of roughly two-thirds of its territory and population, which passed to Czechoslovakia, Romania and Yugoslavia. The treaty's harsh terms fed lasting Hungarian resentment and revisionism in interwar Europe. For UPSC world history it completes the set of Paris peace treaties that redrew the map after the First World War.

Example: signed on 4 June 1920 at the Grand Trianon Palace, Versailles

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Treaty of Versailles

The Treaty of Versailles, signed on 28 June 1919, formally ended World War I between Germany and the Allied powers. It imposed the 'war guilt' clause (Article 231), heavy reparations, territorial losses, and military restrictions on Germany, and created the League of Nations. For UPSC, its punitive terms explain the rise of fascism and German revanchism that led to World War II.

Example: Article 231, the war-guilt clause that became a rallying point for German resentment.

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Treaty of Versailles (1919)

The Treaty of Versailles, signed on 28 June 1919, is the peace settlement that ended the First World War with Germany, imposing war guilt under Article 231, reparations, disarmament and territorial losses that fed later revisionism.

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Treaty of Waitangi 1840

The Treaty of Waitangi of 1840 is the agreement between the British Crown and Maori chiefs that founded colonial New Zealand, ceding sovereignty in the English text while the Maori text guaranteed chieftainship. The gap between its texts still structures New Zealand politics.

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Treaty of Yandabo

The Treaty of Yandabo of 1826 ended the First Anglo-Burmese War. Burma ceded Assam, Manipur, Arakan and Tenasserim to the British, paid an indemnity of one crore rupees, and accepted a British Resident at Ava. It marked the beginning of British expansion into the Northeast and Burma. For UPSC it is the foundational treaty for questions on the annexation of Assam and early British relations with Burma.

Example: signed on 24 February 1826, ceding Assam to the East India Company

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Tree cover

Tree cover is the ISFR category for tree patches below one hectare outside recorded forest areas. As per ISFR 2023 it is 1,12,014 sq km (3.41 per cent).

Example: Farm bunds and urban avenue trees.

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Trees outside forests

Trees outside forests is the umbrella ISFR concept for all trees growing outside recorded forest areas, covering tree cover and forest cover found outside recorded forests.

Example: Agroforestry plantations.

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trellis

A trellis is a lattice screen of carved stone or wood, known in India as jali, fitted into windows and balconies to admit air and light while giving privacy and cooling interiors. Mughal and Rajput builders used geometric and floral stone trellises extensively. It appears in GS-1 art-and-culture questions on the decorative elements of Indo-Islamic architecture.

Example: the marble jali screens of the Taj Mahal complex at Agra

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trench warfare

Trench warfare is combat in which opposing armies fight from systems of fortified ditches, producing static front lines and huge casualties from artillery, machine guns and disease. It defined the Western Front of the First World War after 1914. It is a standard GS-1 modern world history topic explaining the war's stalemate, attrition strategy and human cost.

Example: the Battle of the Somme on the Western Front (1916)

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tri-bhanga

Tri-bhanga is the three-bend pose of Indian sculpture and dance in which the body bends at the neck, waist and knee, forming a graceful S-shaped curve. It lends figures of deities and dancers rhythmic elegance and is a hallmark of classical Indian aesthetics. It is tested in GS-1 art-and-culture through Chola bronzes and temple sculpture.

Example: the tribhanga stance of Krishna as flute-player in Chola bronze icons

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tribal

The tribal is the second of the essay's four standpoints: the Adivasi who loses the forest to the mine and the dam, bearing development's costs while others take its benefits. This voice carries the essay's social dimension, where most environment essays fail. It is the article's moral centre, insisting that displacement is not a footnote.

Example: The essay's standpoint of the forest-dweller who pays development's price.

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tribal assemblies

Tribal assemblies are traditional councils through which tribal communities govern themselves, settle disputes and manage common resources by consensus of elders or the whole village. The Constitution channels this tradition through the Fifth and Sixth Schedules and the PESA Act of 1996. They are key to GS-2 polity answers on tribal self-governance and participatory democracy.

Example: the gram sabha empowered under the PESA Act, 1996 in Scheduled Areas

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Tribal Panchsheel

Tribal Panchsheel is a set of five guiding principles for tribal development articulated by Jawaharlal Nehru in 1952. It holds that tribes should develop along their own genius without imposed assimilation, their rights in land and forests must be respected, and administration should rely on tribal institutions with minimal outside interference. It remains the philosophical anchor of India's tribal policy and the Fifth and Sixth Schedules, making it core prelims and GS-2/GS-4 syllabus material.

Example: Jawaharlal Nehru's five principles of tribal development, 1952

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tribal remainder

The tribal communities are India's Scheduled Tribes: about 8.6 per cent of the population under Census 2011, over 104 million people concentrated in central India and the Northeast, including 75 Particularly Vulnerable Tribal Groups. Constitutional safeguards include the Fifth and Sixth Schedules, the PESA Act of 1996, and the Forest Rights Act of 2006. They are central to GS-1 society and GS-2 governance questions.

Example: the Baiga of Madhya Pradesh, a Particularly Vulnerable Tribal Group

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Tribes Advisory Council

A Tribes Advisory Council is a constitutional body set up under the Fifth Schedule, read with Article 244(1), in every state having Scheduled Areas. It advises the Governor on the welfare and advancement of Scheduled Tribes, and the Governor must consult it before making regulations for Scheduled Areas. For UPSC, it is the key institutional safeguard for tribal interests under the Fifth Schedule framework.

Example: The Tribes Advisory Councils of Jharkhand and Chhattisgarh advise on land and forest governance in Scheduled Areas.

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Tribes Advisory Councils

Tribes Advisory Councils are constitutional advisory bodies mandated by the Fifth Schedule of the Indian Constitution. Each state with Scheduled Areas must have one, composed of up to twenty members, three-fourths of whom must represent Scheduled Tribes in the state legislative assembly. They advise the Governor on the welfare and advancement of Scheduled Tribes and on the administration of Scheduled Areas. Article 244 and the Fifth Schedule make them recurring prelims and GS-2 mains territory.

Example: The Tribes Advisory Council of Jharkhand

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tribhanga

Tribhanga is the thrice-bent posture of Indian classical sculpture and dance, with bends at the neck, torso and leg that give the figure a lyrical S-curve. Seen in images of Krishna, Vishnu and celestial dancers, it expresses the Indian ideal of beauty in movement. UPSC asks it in GS-1 art-and-culture, especially Chola bronze and Odishan temple sculpture.

Example: Krishna as Venugopala in tribhanga in Chola bronzes (9th-13th century)

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Tribunals Reforms Act 2021

The Tribunals Reforms Act 2021 is the Indian law that abolished appellate tribunals such as the Film Certification Appellate Tribunal and the Intellectual Property Appellate Board, transferring their functions to High Courts and other bodies. It also re-enacted tribunal appointment norms, prescribing qualifications, a four-year term, and a minimum age of 50 for chairpersons and members. For UPSC, it is the latest chapter in the tribunal-reform saga shaped by the Supreme Court's Madras Bar Association judgments.

Example: Appeals earlier heard by the Intellectual Property Appellate Board now lie before High Courts.

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Tribunals Reforms Act, 2021

The Tribunals Reforms Act, 2021 is the Indian statute that rationalised the tribunal system by abolishing bodies like the Film Certification Appellate Tribunal and vesting their work in High Courts. It replaced the appointment provisions earlier carried in the Finance Act, 2017, fixing a four-year tenure and eligibility conditions for tribunal members. For UPSC, it illustrates Parliament's legislative response to the Supreme Court's tribunal jurisprudence in the Madras Bar Association line of cases.

Example: It is routinely cited alongside the debate on tribunal independence and the National Tribunals Commission proposal.

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trickle-down, bottom-up, capability, rights-based and Rawlsian

These are five approaches to development: trickle-down (growth first, benefits percolate down), bottom-up (grassroots-led change), capability (Amartya Sen's focus on real freedoms people enjoy), rights-based (development as enforceable legal entitlements) and Rawlsian (priority to the least advantaged, after John Rawls). Comparing them is a staple of GS-2 and GS-4 answers on inclusive growth and social justice.

Example: the rights-based MGNREGA (2005) contrasted with trickle-down growth models

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TRIFED

TRIFED, the Tribal Cooperative Marketing Development Federation of India, is the 1987 national-level cooperative under the Tribal Affairs Ministry that markets tribal products and implements the MSP scheme for minor forest produce. Through Tribes India outlets it links tribal gatherers and artisans to urban markets. It is key to tribal livelihood and value-addition questions. Example: Tribes India stores selling Van Dhan products.

Example: Tribes India stores selling Van Dhan products

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Trigger

Trigger is not a technical UPSC term but a general word that frequently appears in the syllabus as an event or threshold that sets off a predefined action or consequence. UPSC aspirants meet it in contexts like safeguard triggers in trade agreements, automatic trigger clauses in contracts and treaties, or escalation triggers in internal security. Recognizing what a 'trigger' sets in motion helps decode questions across the economy, IR, and governance papers.

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Trikuta temples

Trikuta temples are Hoysala-style temples with three shrines (kuta), as opposed to ekakuta (one) or dvikuta (two). The classification counts sanctums and their towers, and sometimes a trikuta has only one tower over the central shrine, making the label partly symbolic. The Keshava Temple at Somanathapura, built in 1268 CE, is the classic trikuta example. This terminology is a direct prelims target now that the Sacred Ensembles of the Hoysalas are a UNESCO World Heritage Site (2023).

Example: The Keshava Temple at Somanathapura (1268 CE)

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Trinity

The Trinity is the trio of Carnatic music's greatest saint-composers: Tyagaraja, Muthuswami Dikshitar, and Syama Sastri, all active in the Thanjavur region in the late 18th and early 19th centuries. Together they systematized raga, kriti form, and devotional lyricism, effectively founding modern Carnatic music. They are staples of the art-and-culture syllabus, and prelims frequently asks aspirants to identify the members of the Trinity.

Example: Tyagaraja's Pancharatna Kritis, composed at Thiruvaiyaru

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Tripartite Pact

The Tripartite Pact is the September 1940 alliance signed in Berlin by Germany, Italy, and Japan, creating the Axis Powers of World War II. It pledged mutual assistance if any signatory were attacked by a power not yet involved in the war, a clause aimed squarely at deterring the United States. Hungary, Romania, Slovakia, Bulgaria, and Yugoslavia later adhered. It is a standard prelims fact for World War II chronology and wartime alliances.

Example: The signing of the pact in Berlin on 27 September 1940

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Tripartite Struggle

The Tripartite Struggle was the 8th to 10th century contest among the Gurjara-Pratiharas, the Palas, and the Rashtrakutas for control of Kannauj, the symbol of imperial legitimacy in northern India. Decades of shifting alliances and invasions exhausted all three powers and shaped early medieval political geography. For UPSC, it is the defining framework of early medieval north Indian history.

Example: Gurjara-Pratihara king Nagabhata II's capture of Kannauj, marking Pratihara ascendancy in the contest.

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Tripitaka

The Tripitaka is the canonical scripture of Theravada Buddhism, literally 'three baskets': the Vinaya Pitaka (monastic discipline), the Sutta Pitaka (the Buddha's discourses), and the Abhidhamma Pitaka (philosophical analysis). Compiled in Pali, it was first committed to writing in Sri Lanka around the 1st century BCE. Its status as the Pali Canon and the three-baskets structure are classic prelims questions in ancient Indian religion.

Example: The Pali Canon preserved in Sri Lanka

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Triple Alliance

The Triple Alliance of 1882 is the defensive alliance of Germany, Austria-Hungary and Italy that faced the Triple Entente before 1914. Italy's refusal to fight beside its allies in 1914 and its joining the Entente in 1915 show the limits of peacetime alliance paper.

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Triple Alliance 1882

The Triple Alliance of 1882 is the defensive alliance of Germany, Austria-Hungary and Italy that faced the Triple Entente before 1914. Italy's refusal to fight beside its allies in 1914 and its joining the Entente in 1915 show the limits of peacetime alliance paper.

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Triple Alliance of 1882

The Triple Alliance of 1882 is the defensive pact signed in May 1882 between Germany, Austria-Hungary, and Italy, engineered by Otto von Bismarck after German unification. It promised mutual support against attacks by two or more great powers and anchored the alliance system that confronted the Franco-Russian alliance. It matters for UPSC because Bismarck's alliance diplomacy is the standard backdrop to questions on the causes of World War I.

Example: The secret defensive treaty signed at Vienna in May 1882

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triple burden

The triple burden is the simultaneous presence of undernutrition, overnutrition and micronutrient deficiency (hidden hunger) in a population, often within the same household. India faces all three as diets shift and inequality persists. It is a key GS-2 and GS-3 frame for answers on nutrition policy, the National Family Health Survey and POSHAN Abhiyaan.

Example: NFHS-5 (2019-21) recording anaemia alongside rising obesity in India

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triple engine

Triple engine is a political slogan describing aligned governments at the Centre, the state and the local-body level, promising faster development through coordination across all three tiers. It became prominent in BJP campaign rhetoric for state and civic elections. It matters for GS-2 as a lens on Centre-state relations and cooperative federalism debates.

Example: the BJP's 'triple engine sarkar' pitch in the 2023 Uttar Pradesh urban local body polls

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Triple Entente

The Triple Entente is the pre-1914 alignment of France, Russia and Britain, built from the Franco-Russian alliance, the Entente Cordiale of 1904 and the Anglo-Russian convention of 1907. An understanding hardened by crisis into a war coalition; it faced the Triple Alliance.

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TRIPS

TRIPS is the Agreement on Trade-Related Aspects of Intellectual Property Rights, part of the WTO's 1994 Marrakesh package, setting minimum global standards for patents, copyrights, trademarks, and other intellectual property. It obliges members to grant product patents but allows flexibilities like compulsory licensing for public health. For UPSC, TRIPS is central to India's pharmaceutical story: India used its transition period to amend its Patents Act in 2005 while protecting its generic drug industry.

Example: India's 2012 compulsory licence to Natco for the cancer drug Nexavar, the first such licence using TRIPS flexibilities, is the landmark case.

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TRIPS Agreement

The TRIPS Agreement, or the Agreement on Trade-Related Aspects of Intellectual Property Rights, is a WTO agreement that came into force in 1995 setting minimum global standards for intellectual property protection, including patents, copyrights and trademarks. It also contains flexibilities, affirmed by the 2001 Doha Declaration, letting countries protect public health, which India used to build its affordable generic medicines industry.

Example: India amended its Patents Act to comply with TRIPS while using its public-health flexibilities for affordable medicines.

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Tripuri (March 1939)

The Tripuri session is the March 1939 session of the Indian National Congress held at Tripuri near Jabalpur, where Subhas Chandra Bose defeated Mahatma Gandhi's nominee Pattabhi Sitaramayya in the presidential election. The result triggered a constitutional crisis in the Congress: Gandhi declared Pattabhi's defeat his own, and Bose resigned the presidency in April 1939. It is a landmark prelims and modern-history mains event on the Congress-left split.

Example: Bose's victory over Pattabhi Sitaramayya, March 1939

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Tripuri in 1939

Tripuri in 1939 refers to the Congress's 52nd session at Tripuri in Madhya Pradesh in March 1939, the pivot of the nationalist movement's internal crisis. Subhas Chandra Bose's re-election as president over the Gandhi-backed Pattabhi Sitaramayya split the party's right and left wings, leading to Bose's resignation and the formation of the Forward Bloc in May 1939. UPSC tests it as the defining episode of Congress factionalism on the eve of World War II.

Example: Bose founding the Forward Bloc, May 1939

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Triratna

The Triratna, or Three Jewels, are the Buddha, the Dhamma (his teachings), and the Sangha (the monastic community), the three refuges a Buddhist takes through the formula 'Buddham saranam gacchami'. Together they define Buddhist identity, ethics, and community life. For UPSC, the Triratna is foundational to Buddhism questions in ancient history and art, where the three are depicted in stupas and sculpture.

Example: B.R. Ambedkar's mass conversion at Deekshabhoomi, Nagpur, in 1956, where converts took refuge in the Triratna.

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Trombay

Trombay is the suburban Mumbai locality that hosts the Bhabha Atomic Research Centre (BARC), India's premier nuclear research institution, established in 1954 as the Atomic Energy Establishment. It housed Apsara, Asia's first research reactor (commissioned 1956), and the plutonium facilities that supplied material for the 1974 Pokhran test. For UPSC, Trombay is the geography tag for questions on India's nuclear programme and Department of Atomic Energy institutions.

Example: The Apsara research reactor (1956)

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troops

Troops are the soldiers who form the personnel strength of an armed force, distinct from its weapons, vehicles and equipment. In UPSC contexts the term appears in GS-3 internal security and defence questions on border deployment, counter-insurgency operations and peacekeeping commitments.

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trophic levels

Trophic levels are the successive feeding positions in a food chain or food web, each representing how many energy transfers separate an organism from the primary energy source, the Sun. Producers (plants) form level one, primary consumers (herbivores) level two, secondary consumers level three, and so on. Because roughly 90 percent of energy is lost as heat at each transfer, the 10 percent law, food chains rarely exceed four or five levels.

Example: In a grassland food chain: grass (producer) to grasshopper (primary consumer) to frog (secondary consumer) to snake (tertiary consumer) to hawk (quaternary consumer).

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Tropic of Cancer

The Tropic of Cancer is the latitude line at approximately 23.5 degrees north that marks the northernmost point where the Sun can appear directly overhead. In India it passes through eight states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram. The eight-state list and the fact that it nearly bisects the country are perennial prelims map-based questions.

Example: The Tropic of Cancer passing through Ujjain, Madhya Pradesh

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tropical cyclone

A tropical cyclone is an intense rotating storm forming over warm tropical oceans, with sustained winds, heavy rain and storm surge. In India they strike both coasts, deadliest in the Bay of Bengal.

Example: Cyclone Amphan (2020) was a tropical cyclone that devastated West Bengal

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Tropical cyclone structure

A tropical cyclone's structure is the organized system of its rotating low-pressure core: a calm, cloud-free eye at the centre, surrounded by the eyewall of the most intense winds and rainfall, and outer spiral rainbands extending hundreds of kilometres. It draws energy from warm ocean waters and the Coriolis force. The structure, formation conditions, and Indian naming conventions are recurring prelims and GS-1/GS-3 disaster-management material.

Example: Cyclone Biparjoy (2023)

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Tropical Forests Forever Facility (TFFF)

The Tropical Forests Forever Facility is a Brazil-led global fund launched at COP30 in Belem in November 2025 to pay tropical countries for keeping their forests standing. It blends public capital with private market borrowing to generate steady, long-term payments to forest nations proportional to their conserved forest area, verified by satellite imagery, with at least 20 percent of disbursements earmarked for Indigenous peoples and local communities. It rewards conservation rather than restoration.

Example: The United Kingdom's 2026 commitment of a 400 million pound loan to the facility, structured as investment rather than a grant.

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Trotskyism

Trotskyism is the Marxist current led by Leon Trotsky, arguing for permanent revolution and the international spread of socialism, against Stalin's socialism in one country. Trotskyists opposed the bureaucratised Soviet state while defending its planned economy.

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TRP-driven sensationalism

TRP-driven sensationalism is the practice of television news channels prioritizing dramatic, emotional, or provocative coverage to maximize Television Rating Points, the audience metric measured by BARC India. It distorts news judgment, crowds out public-interest reporting, and fuels trial-by-media. For UPSC, it is a recurring GS-2 and GS-4 ethics theme on media accountability, the Press Council's role, and the need for responsible journalism in a democracy.

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true (voussoir) arch

A true (voussoir) arch is an arch built from wedge-shaped stones called voussoirs locked together by a central keystone, carrying loads through compression with no lintel needed below. It replaced the corbelled arch in Indian construction with the Delhi Sultanate. It is a favourite GS-1 art-and-culture prelims fact on Indo-Islamic architecture.

Example: the early true arch in the tomb of Balban at Mehrauli, Delhi (c. 1287)

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true arch arrived scientifically at the Alai Darwaza in 1311

The true arch arrived scientifically at the Alai Darwaza in 1311, the southern gateway of the Quwwat-ul-Islam mosque built under Alauddin Khalji. Its precisely cut voussoir arches mark the first fully scientific use of the true arch in India, a turning point from corbelled construction. It is a classic GS-1 prelims marker for Sultanate architecture.

Example: the Alai Darwaza at the Qutub complex, Delhi (1311)

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true arches, domes and lime mortar

True arches, domes and lime mortar are the three defining construction technologies of Indo-Islamic architecture under the Delhi Sultanate. Voussoir arches and domes spanned large spaces, while lime mortar bonded masonry more durably than earlier dry joints. Together they enabled the great mosques and tombs of the period, a standard GS-1 art-and-culture grouping.

Example: the arches and domes of the 15th-century tombs in Delhi's Lodhi Gardens

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Truman Doctrine

The Truman Doctrine was the US foreign-policy pledge announced by President Harry Truman on 12 March 1947 that America would support 'free peoples' resisting subjugation, beginning with 400 million dollars in aid to Greece and Turkey. It converted anti-communism into a global commitment and launched the containment strategy. For UPSC, it marks the formal start of the Cold War and the bipolar order that shaped India's non-alignment.

Example: The 1947 US aid package to Greece and Turkey that operationalised containment.

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trust

Trust is the confident expectation that another person or institution will act honestly and in good faith, and it forms the basis of social cooperation and legitimate authority. In governance it underpins citizen compliance, institutional credibility and social capital. It is a core GS-4 ethics value, linked to probity, accountability and the citizen-administration relationship.

Example: the trust placed in the Election Commission of India during general elections

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Trust and accountability

Trust and accountability is an ethics (GS-4) value pairing for UPSC: trust is the confidence citizens place in institutions and office-holders, while accountability is the obligation of those office-holders to answer for their decisions and conduct. The two are reciprocal, since public trust erodes wherever accountability is weak and deepens wherever it is enforced through transparency and audit. UPSC mains questions regularly frame this pair in governance and integrity discussions.

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Trusted AI Commons

The Trusted AI Commons is a shared repository of tools, evaluation benchmarks, technical standards and best practices announced at the India AI Impact Summit in New Delhi in February 2026. Backed by 22 partner countries, it gives governments and developers practical resources for building secure and trustworthy AI systems, and sits alongside the summit's Global AI Impact Commons under the New Delhi Declaration. It reflects India's pitch for AI governance rooted in shared, development-oriented infrastructure.

Example: Model-safety benchmarks contributed to the commons for testing AI systems before real-world deployment.

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trustees

Trustees are persons or bodies who hold property, funds or authority for the benefit of others, bound by fiduciary duties of loyalty, care and impartiality. In Gandhian trusteeship the wealthy act as trustees of society's resources rather than absolute owners. The concept appears in GS-4 ethics and GS-2 governance on fiduciary responsibility and corporate social responsibility.

Example: Gandhi's doctrine of trusteeship set out in Hind Swaraj (1909)

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trusteeship

Trusteeship is Gandhi's economic doctrine that the wealthy should hold surplus wealth in trust for the welfare of society rather than for private accumulation. A moral alternative to both unrestrained capitalism and state socialism, it asks owners to act as stewards, using profits for the common good voluntarily. For UPSC, trusteeship is a GS-4 ethics concept, often invoked in debates on corporate social responsibility and the moral limits of wealth.

Example: Gandhi's exposition of trusteeship in his Harijan writings of the 1940s, addressed to Indian industrialists.

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Trusteeship Council

The Trusteeship Council is a principal organ of the United Nations established in 1945 to supervise trust territories moving toward self-government or independence. Its work concluded with the independence of Palau, the last trust territory, in 1994, after which it suspended operations and now meets only as required. It is a crisp prelims fact under international institutions and a favourite mains illustration of completed decolonization.

Example: Palau's independence in 1994

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Trusteeship is

Trusteeship is Gandhi's economic doctrine that the wealthy should hold their riches as trustees for society, using wealth for collective welfare rather than private accumulation. It offered a non-violent alternative to class struggle, expecting voluntary moral conversion of capitalists rather than state expropriation. For UPSC GS-4, it is the ethical counterpoint to both capitalism and communism and echoes in the Directive Principles.

Example: Its reflection in Article 39(b) and (c), which direct the state to prevent the concentration of wealth and means of production.

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Trustworthy AI

Trustworthy AI refers to artificial intelligence systems that are lawful, ethical and robust, behaving reliably, transparently and accountably across their lifecycle. Frameworks from the OECD, the EU AI Act and UNESCO converge on principles such as human oversight, fairness and non-discrimination, privacy, safety, explainability and accountability. For exam purposes, trustworthy AI is the outcome that AI governance instruments are designed to produce.

Example: Mandatory human review of AI-driven decisions in high-risk uses such as hiring, lending or medical diagnosis.

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Truth versus loyalty

Truth versus loyalty is a GS-4 ethics dilemma frame used in UPSC preparation: truth demands honesty and fidelity to facts, while loyalty pulls one toward protecting a person, team, or organization. The two collide when disclosing wrongdoing would betray a colleague or superior, and civil services ethics resolves the conflict in favour of truth and public interest. It is a standard case-study prompt in the aptitude and integrity paper.

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Truthfulness and self-control

Truthfulness and self-control is a GS-4 pairing of foundational ethical values for civil servants. Truthfulness means honesty in word and deed, refusing deception even when convenient, while self-control means mastery over impulse, anger, and temptation. Together they anchor probity: the first guards the integrity of information, the second guards the integrity of action. UPSC asks both as definitional and case-study material in the ethics paper.

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Tsarism

Tsarism is the autocratic system of imperial Russia in which the Tsar held unlimited power, supported by Orthodoxy, the bureaucracy and the police, until 1917. Its refusal to reform after 1905 made revolution, rather than evolution, the country's path.

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TSMC

TSMC, the Taiwan Semiconductor Manufacturing Company, is the world's largest dedicated semiconductor foundry, founded in 1987 by Morris Chang. It manufactures chips designed by other companies, including most of the world's advanced smartphone and AI processors, and its dominance makes Taiwan central to global chip supply chains.

Example: The most advanced processors in flagship smartphones are fabricated by TSMC.

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Tso Kar

Tso Kar is a high-altitude wetland complex in the Changthang region of Ladakh, pairing the hypersaline Tso Kar lake with the freshwater Startsapuk Tso to its south. Designated India's 42nd Ramsar site in November 2020, it is one of the most important breeding areas of the black-necked crane in India and a key staging site on the Central Asian Flyway. Its name means white lake, after the salt efflorescence on its margins.

Example: The black-necked cranes that breed in the Tso Kar basin each summer, alongside bar-headed geese and ruddy shelduck.

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tsunami

A tsunami is a series of large ocean waves generated by undersea earthquakes, volcanic eruptions or landslides displacing massive water volumes. Unlike wind waves, tsunamis involve the whole water column and can travel at jet speeds.

Example: the 2004 Indian Ocean tsunami, triggered by a magnitude 9.1 Sumatra earthquake, devastated Tamil Nadu's coast

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TTC

TTC is a bilateral strategic platform through which two governments coordinate policy on trade, trusted technology, and security. It usually works through ministerial meetings and working groups covering semiconductors, digital connectivity, clean energy, and resilient supply chains. For UPSC, the India-EU TTC (announced April 2022, first ministerial May 2023 in Brussels) is India's first such forum and signals technology-led strategic convergence with Europe.

Example: The India-EU semiconductor cooperation MoU signed around the TTC's first ministerial meeting in Brussels in May 2023.

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Tuberculosis (TB)

Tuberculosis is an infectious disease caused by the bacterium Mycobacterium tuberculosis, most commonly attacking the lungs and spreading through airborne droplets from coughing or sneezing. India carries the world's largest TB burden, and its National TB Elimination Programme targets ending TB by 2025, five years ahead of the global SDG deadline, using the Ni-kshay digital platform for patient tracking. Drug-resistant TB remains a major treatment challenge.

Example: The BCG vaccine administered at birth, which protects young children against severe forms of TB.

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Tughlaqabad

Tughlaqabad is the fortified capital city founded near Delhi by Ghiyasuddin Tughlaq in 1321 after he established the Tughlaq dynasty. Built as a massive stronghold with sloping rubble walls to guard against Mongol invasions, it was largely abandoned after his death in 1325 as the court shifted to Delhi. It is a key prelims and medieval-history site for questions on Tughlaq architecture and the dynasty's origins.

Example: Ghiyasuddin Tughlaq's founding of the city in 1321

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Tughlaqabad Fort

Tughlaqabad Fort is the sprawling fortress forming the core of Ghiyasuddin Tughlaq's capital at Delhi, built in 1321. Its defining features are tapering rubble-masonry walls up to fifteen metres thick, thirteen gates, rainwater tanks, and the adjacent tomb of Ghiyasuddin Tughlaq with its distinctive red-sandstone-and-marble dome. It is a standard prelims monument for Sultanate architecture and for distinguishing Tughlaq austerity from later ornate styles.

Example: The tomb of Ghiyasuddin Tughlaq within the complex

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Tughlaqs

The Tughlaqs are the Delhi Sultanate dynasty that ruled from 1320 to 1414, founded by Ghiyasuddin Tughlaq. The line includes Muhammad bin Tughlaq, famed for ambitious but disastrous experiments like the transfer of the capital to Daulatabad and token currency, and Firoz Shah Tughlaq, known for welfare works and canal building. The dynasty collapsed after Timur's invasion in 1398. It is among the most examined dynasties in UPSC medieval history.

Example: Timur's sack of Delhi in 1398

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Tughlaqs (1320–1414)

The Tughlaqs (1320-1414) are the third and longest-ruling dynasty of the Delhi Sultanate, beginning with Ghiyasuddin Tughlaq's accession. Its high points include the empire's greatest territorial extent under Muhammad bin Tughlaq and Firoz Shah Tughlaq's administrative and irrigation works; its low points include the failed capital transfer to Daulatabad and the collapse that followed Timur's invasion. The dynasty's administrative experiments are staple prelims and GS-1 mains material.

Example: Muhammad bin Tughlaq's transfer of the capital to Daulatabad

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Tulsidas

Tulsidas is the 16th-century Bhakti poet who composed the Ramcharitmanas, the Awadhi retelling of the Ramayana that carried Rama devotion to the masses. A devotee of the saguna tradition, he wrote in the vernacular rather than Sanskrit, alongside works like Vinay Patrika and the Hanuman Chalisa. He is core art-and-culture syllabus material, and prelims frequently pairs him with the Ramcharitmanas, the Bhakti movement, and the reign of Akbar, his contemporary.

Example: The Ramcharitmanas, composed at Varanasi

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Tulughama

Tulughama is the Ottoman-derived battle tactic Babur used at the First Battle of Panipat in 1526: dividing his army into left, right, and centre divisions, with flank 'turning parties' wheeling away and then charging into the enemy's flanks and rear. Combined with the araba cart barricade and field artillery, it let Babur's small force encircle Ibrahim Lodi's much larger army. Tulughama is a high-frequency prelims term for Mughal military history.

Example: The First Battle of Panipat, 21 April 1526

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Tulughma

Tulughma is an alternate spelling of tulughama, Babur's flanking battle formation. It organized the army into left, right, and centre, with mobile turning parties that feigned retreat and then struck the enemy's flanks and rear. At Panipat in 1526 this encirclement, backed by tied carts and cannons, destroyed Ibrahim Lodi's larger host. UPSC prelims uses the term directly in questions on Babur's tactics and the technology of the Mughal conquest.

Example: The First Battle of Panipat, 21 April 1526

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Tuluva (1505–1570)

The Tuluvas (1505-1570) are the third dynasty of the Vijayanagara Empire, founded by Tuluva Narasa Nayaka's line and crowned by the reign of Krishnadevaraya (1509-1529). Under Krishnadevaraya the empire reached its zenith in territory, trade, and Telugu-Sanskrit literature. The dynasty declined after the disastrous Battle of Talikota in 1565. UPSC tests the Tuluva line as the high-water mark of Vijayanagara history.

Example: The Battle of Talikota, 1565

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Tungabhadra

The Tungabhadra is a major east-flowing river of peninsular India, formed by the Tunga and Bhadra streams in Karnataka and joining the Krishna in Andhra Pradesh. It is historically the river of Vijayanagara: the empire's capital Hampi stood on its banks. The Tungabhadra Dam at Hospet is a key multipurpose project. For UPSC it matters in river-system mapping, the Vijayanagara context, and interstate water projects.

Example: The Tungabhadra Dam at Hospet, Karnataka

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Tunguska event of 1908

The Tunguska event of 1908 was an asteroid airburst that flattened about 2,000 square kilometres of Siberian forest.

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tunnelling

Quantum tunnelling is the phenomenon in which a particle passes through an energy barrier that it classically could not surmount, because its wave-like nature gives it a small probability of appearing on the other side. It is a direct consequence of the uncertainty principle and has no classical analogue. Tunnelling underlies phenomena from radioactive decay to the operation of scanning tunnelling microscopes and flash memory.

Example: Quantum tunnelling is essential to nuclear fusion in the Sun, where protons fuse despite repelling each other electrically.

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Turkman Gate

Turkman Gate is one of the surviving southern gates of Shahjahanabad, the walled city Shah Jahan built in the 17th century. It is named after the 13th-century Sufi saint Shah Turkman Bayabani, whose shrine lies nearby, and it stands close to the Ramlila Maidan. The gate also marks the site of the controversial demolitions and violence during the Emergency in 1976. It is relevant for UPSC as Mughal urban heritage and as a modern-history case study of the Emergency.

Example: The Emergency-era demolition drive at Turkman Gate, 1976

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turmeric

Turmeric is the bright-yellow spice and medicinal plant (Curcuma longa) widely used in Indian cooking and Ayurvedic medicine, valued for its active compound curcumin. In intellectual property law it is famous as a biopiracy case: in 1995 the US patent office granted a patent on turmeric's wound-healing properties, which India's CSIR got revoked in 1997 by proving prior art in ancient Sanskrit and Ayurvedic texts. The case spurred India to create the Traditional Knowledge Digital Library (TKDL).

Example: The 1997 revocation of the US patent on turmeric, after CSIR demonstrated the knowledge was centuries-old prior art.

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Turquoise hydrogen

Turquoise hydrogen is hydrogen produced by methane pyrolysis, splitting natural gas into hydrogen and solid carbon without releasing carbon dioxide. It sits between blue hydrogen (made with carbon capture) and green hydrogen (made by renewable-powered electrolysis) as a lower-emission route that avoids both CO2 venting and the need for CO2 storage. The economics hinge on finding markets for the solid carbon byproduct.

Example: The solid carbon produced alongside the hydrogen, which can be sold as carbon black for tyres, batteries and industrial materials.

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Tuti-nama

The Tuti-nama is a 14th-century Persian collection of 52 moral tales narrated by a parrot to deter its mistress Khojasta from infidelity, authored by Ziauddin Nakhshabi. Adapted from the Sanskrit Sukasaptati, it became one of the most illustrated manuscripts of the Mughal age, with Akbar commissioning lavish miniature versions. It is a signature prelims fact for Indo-Persian literature and Mughal manuscript painting.

Example: Akbar's illustrated Tuti-nama manuscripts of the 1550s-1560s

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Tuzuk-i-Baburi (Baburnama)

The Tuzuk-i-Baburi, or Baburnama, is Babur's autobiographical memoir, written in his native Chagatai Turkic. It records his campaigns, the flora and fauna of Hindustan, and remarkably candid self-assessments, and it was later translated into Persian under Akbar. It is the single most important primary source for the First Battle of Panipat and the Mughal conquest. UPSC tests its authorship, language, and historical value in medieval history.

Example: Babur's own account of the First Battle of Panipat, 1526

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Tuzuk-i-Jahangiri

The Tuzuk-i-Jahangiri is the autobiography of the Mughal emperor Jahangir, covering his reign from 1605 until near his death in 1627, with later portions continued by his officers. Written in Persian, it records court politics, campaigns, natural-history observations and the growing influence of Nur Jahan. For UPSC, it is a primary source for Mughal administration and a standard prelims question on Mughal literature.

Example: Jahangir's reign, 1605 to 1627

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TVK rally, Tamil Nadu (2025)

The TVK rally stampede in Karur, Tamil Nadu, in September 2025 killed around 40 people when massive crowds overwhelmed a political rally venue. It highlighted the risks of poorly planned political gatherings.

Example: the tragedy prompted stricter crowd-control norms for rallies in Tamil Nadu

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Twelfth Plan

The Twelfth Plan is India's 12th Five-Year Plan, covering 2012-2017, themed 'Faster, More Inclusive and Sustainable Growth'. It set an 8 percent growth target that was never met, emphasized infrastructure, health, and education, and was the last full plan of the Planning Commission era before NITI Aayog replaced it in 2015. UPSC asks its theme, period, and the planning-to-NITI transition across prelims and GS-3.

Example: The Planning Commission's replacement by NITI Aayog in 2015

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Twelfth Plan (2012-17)

The Twelfth Plan (2012-17) is the final Five-Year Plan produced by the Planning Commission, spanning 2012 to 2017 under the theme 'Faster, More Inclusive and Sustainable Growth'. Its 8 percent growth target fell short, and mid-plan the Commission itself was wound up and replaced by NITI Aayog in January 2015. It marks the formal end of centralized five-year planning in India, a transition UPSC tests in prelims and GS-3.

Example: The formation of NITI Aayog in January 2015

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Twelfth Schedule

The Twelfth Schedule is the constitutional schedule added by the 74th Constitutional Amendment of 1992, listing 18 functional items entrusted to municipalities, such as urban planning, regulation of land use, water supply, public health, and slum improvement. It operationalises the devolution envisaged in Article 243W. For UPSC, it is the urban counterpart of the Eleventh Schedule and a staple of questions on democratic decentralisation.

Example: Municipal preparation of plans for economic development and social justice flows from the Twelfth Schedule.

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twice a day

Twice a day describes the intermittent piped water supply common in many Indian cities, where households receive water for a few morning and evening hours rather than round the clock. It reflects distribution losses, low pressure and unequal access across localities. It fits GS-2 and GS-3 answers on urban water governance and service-level benchmarks.

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Twin Balance Sheet (TBS) problem is

The Twin Balance Sheet (TBS) problem is the situation in which stressed corporate balance sheets and stressed bank balance sheets feed each other: over-leveraged companies default, banks accumulate non-performing assets, and lending freezes, choking investment. The Economic Survey 2015-16 identified it as India's central macro-financial challenge. It is a core GS-3 and prelims concept for questions on NPAs, the IBC of 2016, and bank recapitalization.

Example: The Insolvency and Bankruptcy Code, 2016

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twin-deficit

Twin deficit is the simultaneous occurrence of a fiscal deficit, with government spending exceeding revenue, and a current account deficit, with imports exceeding exports. India has faced both together in stress episodes, raising worries about external financing and macroeconomic stability. It is a standard GS-3 economy concept for fiscal policy and external-sector vulnerability.

Example: India's twin deficits during the 2013 taper-tantrum episode

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two crops a year

Two crops a year, or double cropping, is the practice of raising two harvests from the same land within one agricultural year, enabled by irrigation, short-duration varieties and assured inputs. It pushes cropping intensity above 100% and raises farm incomes. It is central to GS-3 agriculture answers on productivity, irrigation and cropping patterns.

Example: the rice-wheat double-cropping system of Punjab and Haryana

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two full terms

Two full terms is a cap limiting a head of state or office-holder to two complete tenures, the best-known case being the United States President under the 22nd Amendment of 1951. Term limits aim to prevent concentration of power while ensuring leadership renewal. The concept appears in GS-2 comparative-constitution answers on executive tenure and democratic safeguards.

Example: the US presidency's two-term limit under the 22nd Amendment (1951)

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two independent dominions — India and Pakistan

Two independent dominions, India and Pakistan, were created by the Indian Independence Act of 1947, each with its own constituent assembly and dominion status under the Crown until it adopted a republican constitution. Partition followed the Mountbatten Plan of 3 June 1947. The provision is the pivot of GS-1 and GS-2 answers on independence and partition.

Example: the Indian Independence Act receiving royal assent on 18 July 1947

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Two leagues

Two leagues is not a standard UPSC term and reads as an extraction fragment; the substantive word is 'league', an old unit of distance roughly equal to three miles or about 4.8 kilometres, used in historical and literary sources. Aspirants may meet leagues in translated medieval accounts and colonial narratives where distances are stated in leagues rather than miles or kilometres. Treat the phrase as a measurement fragment, not a concept.

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two masters — the revenue collector and the world price

The 'two masters', the revenue collector and the world price, describes the colonial Indian peasant's double burden: fixed land revenue demanded by the state regardless of the harvest, and volatile global commodity prices set by distant markets. It captures why commercialisation of agriculture immiserised cultivators. The image suits GS-1 answers on the economic impact of British rule.

Example: Deccan cotton cultivators during the 1860s American Civil War price boom

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two-masted ship with a fish

A two-masted ship with a fish is a motif depicted on a Harappan seal, showing a vessel with two masts alongside a fish, a sign that occurs frequently in the Indus script. Such imagery is cited as evidence of Harappan maritime capability and trade links with Mesopotamia. It fits GS-1 ancient history answers on Indus Valley trade and craft.

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two-nation theory

The two-nation theory is the claim that the Hindus and Muslims of British India were two separate nations deserving separate states, articulated by Muhammad Ali Jinnah and adopted by the Muslim League in its Lahore Resolution of 1940. It supplied the ideological basis for Pakistan's creation in 1947. It is indispensable for GS-1 modern history answers on partition.

Example: the Muslim League's Lahore Resolution (23 March 1940)

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two-thirds (tebhaga)

Tebhaga, meaning 'two-thirds', was the 1946-47 demand of Bengal's sharecroppers (bargadars) for two-thirds of the harvest instead of the customary half, led by the Kisan Sabha. The movement spread across North Bengal and won concessions after independence. It is a key GS-1 example of peasant movements, alongside Telangana and Punnapra-Vayalar.

Example: the Tebhaga agitation in Dinajpur and Jalpaiguri (1946)

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two-tier offence framework

A two-tier offence framework is a penalty structure with two levels of punishment, as in the Digital Personal Data Protection Act of 2023, which prescribes graded financial penalties up to Rs 250 crore for data fiduciaries based on the gravity of the breach. It balances deterrence with proportionality. The model appears in GS-2 and GS-3 answers on data protection and regulatory design.

Example: graded penalties under the Digital Personal Data Protection Act, 2023

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Two: set the compass before you dissect

'Two: set the compass before you dissect' is a study-tip fragment rather than a syllabus term, pointing to a mains answer-writing heuristic: fix your overall direction, stance, and structure (the 'compass') before dissecting the question into parts. In GS and essay writing, deciding the argument's arc first keeps multi-part answers coherent and prevents drifting into irrelevant detail. It has no formal definition and no verifiable example.

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Tyagaraja

Tyagaraja is the foremost saint-composer of Carnatic music and a member of its Trinity, active in the Thanjavur region in the late 18th and early 19th centuries. A devotee of Rama, he composed thousands of kritis, including the Pancharatna Kritis, that fused bhakti lyricism with rigorous raga grammar. The annual Tyagaraja Aradhana at Thiruvaiyaru honours him. He is a permanent fixture of the art-and-culture syllabus for prelims.

Example: The Tyagaraja Aradhana festival at Thiruvaiyaru, Tamil Nadu

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Type

Type denotes a category or class within a classification, used to organise phenomena into comparable kinds (types of volcanoes, types of unemployment, types of government). In UPSC answers, typing is an analytical device that brings structure to descriptive questions across geography, economy, and polity. As a standalone word it carries no independent doctrinal meaning in the syllabus.

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