/ Dictionary / Index A A.A.A.S.: Meaning and Definition of Find definitions for: A.A.A.S. Pronunciation: [key] American Association for the Advancement of Science. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aaas (Thesaurus) A.A.A.L. Aachen Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language