/ Dictionary / Index O Opp.: Meaning and Definition of Find definitions for: Opp. Pronunciation: [key] opuses; opera. opp. Pronunciation: [key] opposed. opposite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. opotherapy Oppenheim 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