/ Dictionary / Index O OAP: Meaning and Definition of Find definitions for: OAP Pronunciation: [key] — Brit. Brit. old-age pensioner. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. OAO OAPC Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language