/ Dictionary / Index T trial run: Meaning and Definition of Find definitions for: tri'al run' Pronunciation: [key] a preliminary performance or test of something, as of the operation of a ship or the effectiveness of a play. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trialogue Trial, The* Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language