/ Dictionary / Index T triplex: Meaning and Definition of Find definitions for: tri•plex Pronunciation: (trip'leks, trī'pleks), [key] — adj. threefold; triple. —n. something triple. See an apartment having three floors. a multiplex of three theaters or movie houses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: triplex (Thesaurus) triple witching hour triplicate Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language