Word.ws English Dictionary

eon

UK/ˈiː.ɔn//ˈi.ɑn/

eon noun: eternity, the duration of the universe.

Noun

eon (plural eons)

  1. Eternity, the duration of the universe.
  2. An immeasurably or indefinitely long period of time.
  3. (US, excessive, informal) A long period of time.
    • It’s been eons since we last saw each other.
    • Traditionally, a luncheon is a lunch that takes an eon.1990, Judith Martin, Miss Manners’ Guide for the Turn-of-the-Millennium (A Fireside Book), New York, N.Y.: Simon & Schuster, →ISBN, page 453
  4. A period of one billion (short scale, i.e. 1,000,000,000) years; a gigayear.
    • We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year.2012 January, Robert L. Dorit, “Rereading Darwin”, in American Scientist, volume 100, number 1, archived from the original on 14 Nov 2012, page 23
  5. The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.
  6. A spirit being emanating from the Godhead.

Proper noun capitalized: EON

EON

  1. The Greek National Organisation of Youth, similar to the Hitler Youth. It was formed before WWII and disbanded in 1941.

eon meaning in Hindi and Tamil

eon in Hindi

eternity
अनंतकाल anantkāl

eon in Tamil

மிக நீண்ட கால இடைவெளி, பேரூழி

Examples of eon in a sentence

  • The fossils date back to the Precambrian eon.
  • For eons, the Coasties have served as the final redundant safety systems of our boats.
  • Skinks are lizards, but some species have lost their limbs over eons of evolution, giving them a snakelike look.

All 17 example sentences with eon

Synonyms of eon

15 more synonymsFewer synonyms

Antonyms

All synonyms and antonyms of eon

Forms of eon

pluraleons
alternative Commonwealthaeon
alternative form (dated)æon

Plural of eon: eons

Origin of eon

From Latin aeon, from Ancient Greek αἰών (aiṓn, “age, era”).

From Greek ΕΟΝ (EON), short for Εθνική Οργάνωση Νεολαίας.

Words formed from eon

Words that rhyme with eon

Questions about eon

What does eon mean?
Eon means eternity, the duration of the universe.
What is eon in Hindi?
Eon in Hindi is अनंतकाल (anantkāl). See Eon meaning in Hindi.
What part of speech is eon?
Eon can be a noun or a proper noun.
How do you pronounce eon?
Eon is pronounced /ˈi.ɑn/ (US).
What is the plural of eon?
The plural of eon is eons.

Words near eon in the dictionary

  1. Eoms
  2. eomyid
  3. eomyids
  4. eomysticetid
  5. eomysticetids
  6. eon
  7. Eonavian
  8. EONGY
  9. EONIA
  10. eonial
  11. eonian

Source and license

Adapted from Wiktionary: eon (page history and authors); EON (page history and authors); eon (Tamil Wiktionary) (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: en-us-eon.ogg, en-au-eon.ogg.

Cite this entry: “eon.” Word.ws, https://word.ws/eon. Based on Wiktionary, CC BY-SA 4.0.