eon

noun \ ˈē-ən , ˈē-ˌän \
variants: or chiefly British
Updated on: 17 Apr 2018

Definition of eon

1 : an immeasurably or indefinitely long period of time : age
  • I haven't seen him in eons.
2 a : a very large division of geologic time usually longer than an era
  • the Archean eon
b : a unit of geologic time equal to one billion years

Recent Examples of eon from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'eon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of eon

Latin, from Greek aiōn — more at 3aye


EON Defined for Kids

eon

Definition of eon for Students



Seen and Heard

What made you want to look up eon? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a large number

Get Word of the Day daily email!

Test Your Vocabulary

Odd Habits and Quirks Quiz

  • image1926873504
  • Which of the following best describes an easily irritated person?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!