/ Dictionary / Index H half-duplex: Meaning and Definition of Find definitions for: half'-du'plex Pronunciation: (haf'd'pleks, -dy'-, häf'-), [key] — adj. of or pertaining to the transmission of information in opposite directions but not simultaneously. Cf. full-duplex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. half-dozen half eagle Related Content Daily Word Quiz: divulge Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language