/ Dictionary / Index A aet.: Meaning and Definition of Find definitions for: aet. Pronunciation: [key] at the age of. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. aestivate aetatis suae* Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language