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or aeon

[ee-uh n, ee-on] /ˈi ən, ˈi ɒn/
an indefinitely long period of time; age.
the largest division of geologic time, comprising two or more eras.
Astronomy. one billion years.
Origin of eon
See origin at aeon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for eons
Contemporary Examples
Historical Examples
  • As China was for centuries, so for eons we of this earth have been isolated.

    The Fire People

    Ray Cummings
  • At last, after eons, they reached the corner of her own yard.

    Missy Dana Gatlin
  • Presently, after eons it seemed, she desperately evoked a small, jerky voice.

    Missy Dana Gatlin
  • The six days of Creation were six eons or geological periods.

  • After eons and eons of time the band played "Home, Sweet Home."


    Alice Hegan Rice
  • The icy breeze tore tiny puffs of dust from grotesque, angling drifts of soil, nearly waterless for eons.

    The Eternal Wall Raymond Zinke Gallun
British Dictionary definitions for eons


/ˈiːən; ˈiːɒn/
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
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Word Origin and History for eons



1640s, from Latin aeon, from Greek aion "age, vital force, a period of existence, lifetime, generation;" in plural, "eternity," from PIE root *aiw- "vital force, life, long life, eternity" (cf. Sanskrit ayu "life," Avestan ayu "age," Latin aevum "space of time, eternity," Gothic aiws "age, eternity," Old Norse ævi "lifetime," German ewig "everlasting," Old English a "ever, always").

Online Etymology Dictionary, © 2010 Douglas Harper
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eons in Science
The longest division of geologic time, containing two or more eras.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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