/ Dictionary / Index A A.A.U.: Meaning and Definition of Find definitions for: A.A.U. Pronunciation: [key] Amateur Athletic Union. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. A.A.S. A.A.U.P. Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language