| tangential | (adjective) of or relating to or acting along or in the direction of a tangent | - |
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| (adjective) of superficial relevance if any | Synonyms: digressive |
| tercentennial | (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, triennial |
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| terrestrial | (adjective) operating or living or growing on land | - |
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| (adjective) of or relating to or inhabiting the land as opposed to the sea or air | Synonyms: tellurian, telluric, terrene |
| (adjective) of or relating to or characteristic of the planet Earth or its inhabitants | Synonyms: planetary |
| (adjective) of this earth | Synonyms: sublunar, sublunary |
| (adjective) concerned with the world or worldly matters | Synonyms: mundane |
| territorial | (adjective) belonging to the territory of any state or ruler | - |
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| (adjective) displaying territoriality; defending a territory from intruders | - |
| (adjective) of or relating to a territory | - |
| (noun) a territorial military unit | Synonyms: territorial reserve |
| (noun) nonprofessional soldier member of a territorial military unit | - |
| testimonial | (adjective) of or relating to or constituting testimony | - |
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| (adjective) expressing admiration or appreciation | - |
| (noun) something that recommends (or expresses commendation of) a person or thing as worthy or desirable | Synonyms: good word, recommendation |
| (noun) something given or done as an expression of esteem | Synonyms: tribute |
| (noun) something that serves as evidence | Synonyms: testimony |
| tibial | (adjective) relating to or located near a tibia | - |
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| tonsorial | (adjective) of or relating to barbers and barbering | - |
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| torrential | (adjective) relating to or resulting from the action of a torrent | - |
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| (adjective) pouring in abundance | - |
| (adjective) resembling a torrent in force and abundance | - |
| trial | (noun) the act of testing something | Synonyms: run, test |
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| (noun) (law) the determination of a person's innocence or guilt by due process of law | - |
| (noun) the act of undergoing testing | Synonyms: test |
| (noun) trying something to find out about it | Synonyms: test, trial run, tryout |
| (noun) an annoying or frustrating or catastrophic event | Synonyms: tribulation, visitation |
| (noun) (sports) a preliminary competition to determine qualifications | - |
| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| triennial | (adjective) occurring every third year or lasting 3 years | - |
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| (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, tercentennial |
| trivial | (adjective) concerned with trivialities | - |
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| (adjective) of little substance or significance | Synonyms: superficial |
| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, lilliputian, little, niggling, petty, picayune, piddling, piffling |
| tutorial | (adjective) of or relating to tutors or tutoring | - |
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| (noun) a session of intensive tuition given by a tutor to an individual or to a small number of students | - |
| unceremonial | (adjective) without ceremony or formality | Synonyms: unceremonious |
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| uncial | (adjective) relating to or written in majuscule letters (which resemble modern capitals) | - |
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| (noun) a style of orthography characterized by somewhat rounded capital letters; found especially in Greek and Latin manuscripts of the 4th to 8th centuries | - |
| uncommercial | (adjective) not conducive to commercial success | - |
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| uncongenial | (adjective) not suitable to your tastes or needs | Synonyms: incompatible |
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| (adjective) used of plant stock or scions; incapable of being grafted | - |
| (adjective) very unfavorable to life or growth | Synonyms: hostile, unfriendly |
| uncontroversial | (adjective) not likely to arouse controversy | Synonyms: noncontroversial |
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| uncordial | (adjective) lacking warmth or friendliness | - |
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| undeferential | (adjective) not showing courteous respect | - |
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| unessential | (adjective) not basic or fundamental | Synonyms: inessential |
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| unifacial | (adjective) having but one principal or specialized surface | - |
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| uninfluential | (adjective) not influential | - |
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| unofficial | (adjective) not having official authority or sanction | - |
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| (adjective) not officially established | - |
| unpresidential | (adjective) not presidential | - |
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| unsocial | (adjective) not seeking or given to association; being or living without companions | - |
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| unsubstantial | (adjective) lacking material form or substance; unreal | Synonyms: insubstantial, unreal |
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| urial | (noun) bearded reddish sheep of southern Asia | Synonyms: Ovis vignei |
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| uxorial | (adjective) befitting or characteristic of a wife | Synonyms: wifelike, wifely |
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| venial | (adjective) easily excused or forgiven | Synonyms: excusable, forgivable |
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| (adjective) warranting only temporal punishment | Synonyms: minor |
| vestigial | (adjective) not fully developed in mature animals | Synonyms: rudimentary |
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| vial | (noun) a small bottle that contains a drug (especially a sealed sterile container for injection by needle) | Synonyms: ampoule, ampul, ampule, phial |
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| vicarial | (adjective) of or relating to or characteristic of a vicar | - |
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| vicennial | (adjective) occurring once every 20 years | - |
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