| trilateral | (adjective) having three sides | Synonyms: three-sided, triangular |
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| (adjective) involving three parties | - |
| (noun) a three-sided polygon | Synonyms: triangle, trigon |
| trilby | (noun) a hat made of felt with a creased crown | Synonyms: fedora, felt hat, homburg, Stetson |
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| trilingual | (adjective) using or knowing three languages | - |
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| trill | (noun) a note that alternates rapidly with another note a semitone above it | Synonyms: shake |
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| (noun) the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula | - |
| (verb) sing or play with trills, alternating with the half note above or below | Synonyms: quaver, warble |
| (verb) pronounce with a trill, of the phoneme `r' | - |
| trilled | (adjective) uttered with a trill | Synonyms: rolled, rolling |
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| trillion | (adjective) one million million in the United States | - |
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| (adjective) one quintillion in Great Britain | - |
| (noun) the number that is represented as a one followed by 12 zeros | Synonyms: 1000000000000, one million million |
| (noun) the number that is represented as a one followed by 18 zeros in the UK | Synonyms: one million million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, billion, gazillion, jillion, million, zillion |
| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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| (noun) one part in a trillion equal parts | Synonyms: one-trillionth |
| trillium | (noun) any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower | Synonyms: wake-robin, wood lily |
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| trilobate | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobated, trilobed |
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| trilobated | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobate, trilobed |
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| trilobed | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobate, trilobated |
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| trilobite | (noun) an extinct arthropod that was abundant in Paleozoic times; had an exoskeleton divided into three parts | - |
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| trilogy | (noun) a set of three literary or dramatic works related in subject or theme | - |
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