/ Dictionary / Index D duplex apartment: Meaning and Definition of Find definitions for: du'plex apart'ment Pronunciation: [key] an apartment with rooms on two connected floors. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. duplex duplexer Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language