/ Dictionary / Index T trigram: Meaning and Definition of Find definitions for: tri•gram Pronunciation: (trī'gram), [key] — n. a sequence of three adjacent letters or symbols. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trigram (Thesaurus) trigonum trigraph Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language