/ Dictionary / Index Q quinquevalent: Meaning and Definition of Find definitions for: quin•que•va•lent Pronunciation: (kwing"kwu-vā'lunt, kwin"-, kwin-kwev'u-lunt, kwing-), [key] — adj. Chem. pentavalent. exhibiting five valences, as phosphorus with valences 5, 4, 3, 1, and −3. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quinquepartite quinsy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language