eon

or ae·on

[ ee-uhn, ee-on ]

/ ˈi ən, ˈi ɒn /

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See synonyms for eon on Thesaurus.com

noun

an indefinitely long period of time; age.

the largest division of geologic time, comprising two or more eras.

Astronomy. one billion years.

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Origin of eon

see origin at aeon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use eon in a sentence

Separated from all the adults, his walk to the container under the guns of a dozen strangers lasts eons.
‘The Walking Dead’ Season Finale Review of ‘A’: Rick Grimes Is a Murderer|Melissa Leon|March 31, 2014|DAILY BEAST
These molecules have been at it for eons—they were engineered in the oldest workshop on earth: evolution.
The Big Idea: Werner Loewenstein’s ‘Physics in Mind’|Werner Loewenstein|February 8, 2013|DAILY BEAST
The real award, however, went to Girls, the first Best Comedy award not given to Modern Family seemingly in eons.
Golden Globes 2013: Amy Poehler, Tina Fey & More Best Moments (VIDEO)|Kevin Fallon|January 14, 2013|DAILY BEAST
In the eons since those corals were formed, two hours have been added to every day.
How Long Is a Year? Is the Earth Slowing Down? And Other Questions About Time|Neil Shubin|January 6, 2013|DAILY BEAST

Women have been slaving away in the kitchen for eons, maybe a little bit longer.
Sex and the Kitchen|Elizabeth Cline|June 25, 2009|DAILY BEAST
As China was for centuries, so for eons we of this earth have been isolated.
The Fire People|Ray Cummings
I've been taught that eons ago our remote ancestors fought the Hunters, and lost, and fled, and were pursued.
The Link|Alan Edward Nourse
He seemed to have progressed through eons of experience since he talked with them last night.
The Witness|Grace Livingston Hill Lutz
Details had vanished eons ago, but something still remained to tantalize imagination.
Shock Treatment|Stanley Mullen
Will joyous song and endless calm to that bold spirit be a balm, while silent eons flow?
Uncle Walt [Walt Mason]|Walt Mason

British Dictionary definitions for eon

eon

/ (ˈiːən, ˈiːɒn) /

noun

the usual US spelling of aeon

geology the longest division of geological time, comprising two or more eras

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for eon

eon

[ ē′ŏn′ ]

The longest division of geologic time, containing two or more eras.