/ Dictionary / Index T triple-decker: Meaning and Definition of Find definitions for: tri•ple-deck•er Pronunciation: (trip'ul-dek'ur), [key] — n. three-decker (defs. 3, 4). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: triple-decker (Thesaurus) Triple Crown triple-digit Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language