/ Dictionary / Index O op: Meaning and Definition of Find definitions for: op Pronunciation: (op), [key] — n. See OP Pronunciation: [key] observation post. op- Pronunciation: [key] var. of(by assimilation) before p: oppose. Op. Pronunciation: [key] opus. op. Pronunciation: [key] opera. operation. opposite. opus. O.P. Pronunciation: [key] observation post. See Order of Preachers (Dominican). out of print. overproof. o.p. Pronunciation: [key] out of print. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oozy OPA Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language