Breadcrumb Home > Dictionary > Index O Cite 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 TrendingHere are the facts and trivia that people are buzzing about. February 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress The Women's March on Versailles Keeping Your Brain Active in a COVID-19 World The Manchu Related Content Daily Word Quiz: obscurant Analogy of the Day: Today?s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language