Breadcrumb Home > Dictionary > Index E eon: Meaning and Definition of Find definitions for: e•on Pronunciation: (ē'un, ē'on), [key] — n. an indefinitely long period of time; age. the largest division of geologic time, comprising two or more eras. one billion years. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eon (Thesaurus) e.o.m. eonian TrendingHere are the facts and trivia that people are buzzing about. Hard Labor Current Events This Week: June 2023 Languages Spoken in Each Country of the World User's Guide to Environmental Language The Washington Monument: Facts, History & Profile LGBT Pride Month | Biographies of Notable Individuals Civilian Labor Force ✖ Related Content Daily Word Quiz: poetaster Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language