/ Dictionary / Index F fourplex: Meaning and Definition of Find definitions for: four•plex Pronunciation: (fôr'pleks, fōr'-), [key] — n. Archit. quadplex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fourpenny fourposter Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language