/ Dictionary / Index Q quadplex: Meaning and Definition of Find definitions for: quad•plex Pronunciation: (kwod'pleks"), [key] — adj. fourfold; quadruple. —n. Also calleda building having four dwelling or commercial units. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quad left quadr- Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language