/ Dictionary / Index Q quadriennium: Meaning and Definition of Find definitions for: quad•ri•en•ni•um Pronunciation: (kwod"rē-en'ē-um), [key] — pl. -ni•ums, -ni•a quadrennium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quadriennial quadrifid Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language