/ Dictionary / Index A aeonian: Meaning and Definition of Find definitions for: ae•o•ni•an Pronunciation: (ē-ō'nē-un), [key] — adj. eternal; everlasting. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aeonian (Thesaurus) aeon Aepyornis* Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language