/ Dictionary / Index Q quadruplex: Meaning and Definition of Find definitions for: quad•ru•plex Pronunciation: (kwod'roo-pleks", kwo-dr'pleks), [key] — adj. fourfold; quadruple. noting or pertaining to a system of telegraphy by which four messages may be transmitted simultaneously over one wire or communications channel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: quadruplex (Thesaurus) quadruple time quadruplicate Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language