/ Dictionary / Index O O and O: Meaning and Definition of Find definitions for: O and O Pronunciation: (ō' und ō'), [key] owned and operated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oak wilt OAO Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language