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