Search Dictionary
Definition of eon

eon

/ˈiː.ɒn/
(UK: aeon)
e · on
Plural:eons
•
Adjective:eonian
JUMP TO:

eon Lexical Profile

eon Game Scores & Validity

• noun

1

An indefinitely long and immeasurable period of time; an age.

Example

"The ancient canyon was carved by the river over the course of many eons."

2

In geology, the largest formal division of geologic time, subdivided into eras and spanning hundreds of millions or billions of years; in astronomy, a unit of time equal to one billion years.

Example

"The Phanerozoic eon encompasses the entire span of abundant animal and plant life on Earth."

Synonyms
View all synonyms for eon
Antonyms
View all antonyms for eon

• Rhymes for eon

• Nearby Words

envy
enwrap
enzyme
eon
epa
epacris
epaulet

Word Origin & Etymology

Borrowed in the 17th century via ecclesiastical Latin 'aeon' from Ancient Greek 'aiōn', meaning 'age, vital force, or eternity'.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Eon. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/eon
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.