/ Dictionary / Index O OA: Meaning and Definition of Find definitions for: OA Pronunciation: [key] office automation. o/a Pronunciation: [key] on or about. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. O, o oaf 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