/ Dictionary / Index D diplex: Meaning and Definition of Find definitions for: di•plex Pronunciation: (dī'plex), [key] — adj. pertaining to the simultaneous operation of two radio transmitters or to the simultaneous reception and transmission of radio signals over a single antenna through the use of two frequencies. Cf. multiplex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diplegia diplo- Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language