/ Dictionary / Index O oxidation-reduction: Meaning and Definition of Find definitions for: ox•i•da•tion-re•duc•tion Pronunciation: (ok"si-dā'shun-ri-duk'shun), [key] — Chem. Chem. —n. a chemical reaction between two substances in which one substance is oxidized and the other reduced. —adj. of or pertaining to such a reaction. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oxidation-reduction (Thesaurus) oxidation potential oxidation state Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language