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triangulation (n.)[triangulation 词源字典]: 1809, from French triangulation, from Medieval Latin triangulationem (mid-12c., nominative triangulatio), noun of action from Latin *triangulare, from triangulum (see triangle).[triangulation etymology, triangulation origin, 英语词源]
triannual (adj.): 1630s, from tri- + annual (adj.). Related: Triannually.
Triassic (adj.): 1841, from German, coined 1841 by German geologist Friedrich August von Alberti (1795-1878), from Trias "period preceding the Jurassic," from Greek trias "triad, the number three" (see triad). So called because it is divisible (in Germany) into three groups.
triathlete (n.): by 1983; see triathlon + athlete.
triathlon (n.): 1970, from tri- "three" + Greek athlon "contest;" formed on model of decathlon, biathlon, etc. Originally of various combinations of events; one of the earliest so called combined clay-pigeon shooting, fly-fishing, and horse-jumping; another was cross-country skiing, target shooting, and a giant slalom run; and a third connected to the U.S. Army involved shooting, swimming, and running. Applied to the combination of a long swim, a bicycle-race, and a marathon by 1981.
triaxial (adj.): 1886, from tri- + axial.
tribadism (n.): "lesbian sexual activity," 1811, with -ism + tribade (n.), c. 1600, "a lesbian," from French tribade (16c.) or directly from Latin tribas, from Greek tribas, from tribein "to rub, rub down, wear away," from PIE root *tere- (1) "to rub, turn, twist" (see throw (v.)). In reference to a specific sexual technique, from 1965.
tribal (adj.): 1630s, "pertaining to or characteristic of tribes," from tribe + -al (1). Meaning "characterized by a strong sense of loyalty to one's group" is from 1951 (Arendt). As a style of belly-dance from 1999, American English. Related: Tribally.
tribalism (n.): 1868, "condition of being a tribe," from tribal + -ism. Meaning "group loyalty" attested by 1955.
tribe (n.): mid-13c., "one of the twelve divisions of the ancient Hebrews," from Old French tribu or directly from Latin tribus "one of the three political/ethnic divisions of the original Roman state" (Tites, Ramnes, and Luceres, corresponding, perhaps, to the Latins, Sabines, and Etruscans), later, one of the 30 political divisions instituted by Servius Tullius (increased to 35 in 241 B.C.E.), of unknown origin. Perhaps from tri- "three" + *bheue-, root of the verb be. Others connect the word with the PIE root *treb- "a dwelling" (see tavern).

In the Biblical sense, which was the original one in English, the Latin word translates Greek phyle "race or tribe of men, body of men united by ties of blood and descent, a clan" (see phylo-). Extension to modern ethnic groups or races of people is from 1590s, specifically "a division of a barbarous race of people, usually distinguishable in some way from their congeners, united into a community under a recognized head or chief" [Century Dictionary], but colloquially of any aggregate of individuals of a kind.
TriBeCa: 1983, area in Manhattan between Broadway and the Hudson, south of Greenwich Village, from "triangle below Canal (Street)."
tribesman (n.): 1798, from genitive of tribe (n.) + man (n.).
tribology (n.): 1965, "study of friction," from comb. form of Greek tribos "rubbing," from tribein "to rub, rub down, wear away" (from PIE root *tere- (1) "to rub, turn, twist;" see throw (v.)) + -logy.
tribulation (n.): c. 1200, from Old French tribulacion (12c.), from Church Latin tribulationem (nominative tribulatio) "distress, trouble, affliction," noun of action from past participle stem of tribulare "to oppress, afflict," a figurative use by Christian writers of Latin tribulare "to press," also possibly "to thresh out grain," from tribulum "threshing sledge," from stem of terere "to rub" (see throw (v.)) + -bulum, suffix forming names of tools.
tribunal (n.): early 15c., "a judgement seat," from Old French tribunal "justice seat, judgement seat" (13c.) and directly from Latin tribunal "platform for the seat of magistrates, elevation, embankment," from tribunus "official in ancient Rome, magistrate," literally "head of a tribe" (see tribune). Hence, "a court of justice or judicial assembly" (1580s).
tribune (n.): late 14c., title of an official in ancient Rome, from Latin tribunus "magistrate" (specifically one of the officers appointed to protect the rights and interests of the plebeians from the patricians), originally "head of a tribe" (in the Roman sense), from tribus (see tribe). Also "raised platform" (1762), from Italian tribuna, from Medieval Latin tribuna, from Latin tribunal in its classical sense "platform for the seats of magistrates in ancient Rome."
tributary (adj.): late 14c., "paying tribute," from Latin tributarius "liable to tax or tribute," from tributum (see tribute).
tributary (n.): late 14c., "person, country, etc. owing obedience or paying tribute or a tax to a sovereign or another people," from Latin tributarius (see tributary (adj.)). Meaning "stream that flows into a larger body" is from 1822, from the adjective in this sense, which is recorded from 1610s.
tribute (n.): mid-14c., "stated sum of money or other valuable consideration paid by one ruler or country to another in acknowledgment of submission or as the price of peace or protection," from Anglo-French tribute, Old French tribut and directly from Latin tributum "tribute, a stated payment, a thing contributed or paid," noun use of neuter of tributus, past participle of tribuere "to pay, assign, grant," also "allot among the tribes or to a tribe," from tribus (see tribe). Sense of "offering, gift, token" is first recorded 1580s.
trice (v.): late 14c., "haul up and fasten with a rope," from Middle Dutch trisen "hoist," from trise "pulley," of unknown origin. Hence at a tryse (mid-15c.) "in a very short time," literally "at a single pluck or pull." The Middle Dutch word is the source of Dutch trijsen "to hoist" and is cognate with Middle Low German trissen (source of Danish trisse, German triezen); its ultimate origin is unknown.