/ Dictionary / Index M Metroplex: Meaning and Definition of Find definitions for: Met•ro•plex Pronunciation: (me'tru-pleks"), [key] — n. a vast metropolitan area that encompasses several cities and their suburbs: We're moving to the Dallas-Ft. Worth Metroplex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metronymic metropolis Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language