/ Dictionary / Index T tricentennial: Meaning and Definition of Find definitions for: tri•cen•ten•ni•al Pronunciation: (trī"sen-ten'ē-ul), [key] — adj. pertaining to 300 years or a period of 300 years. marking the completion of such a period: a tricentennial celebration. —n. a 300th anniversary or its celebration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tricentennial (Thesaurus) trice triceps Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language