/ Dictionary / Index T trilinear: Meaning and Definition of Find definitions for: tri•lin•e•ar Pronunciation: (trī-lin'ē-ur), [key] — adj. of, pertaining to, or bounded by three lines. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trilemma trilingual Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language