/ Dictionary / Index O oz. av.: Meaning and Definition of Find definitions for: oz. av. Pronunciation: [key] ounce avoirdupois. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ozark Mountains Ozawa Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language