/ Dictionary / Index O OAPC: Meaning and Definition of Find definitions for: OAPC Pronunciation: [key] Office of Alien Property Custodian. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. OAP oar Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language