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eon

or aeon

[ee-uh n, ee-on] /ˈi ən, ˈi ɒn/
noun
1.
an indefinitely long period of time; age.
2.
the largest division of geologic time, comprising two or more eras.
3.
Astronomy. one billion years.
Origin of eon
see aeon
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for eons
Contemporary Examples
Historical Examples
  • As he stood leaning over the railing, he had a painful vision of the sum total of life and death within the eons of life on earth.

    Atlantis Gerhart Hauptmann
  • 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.

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

    The Eternal Wall Raymond Zinke Gallun
  • At least it had been warm enough to evolve life of the highest order, eons ago.

    The Planet Strappers Raymond Zinke Gallun
  • 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
British Dictionary definitions for eons

eon

/ˈiːən; ˈiːɒn/
noun
1.
the usual US spelling of aeon
2.
(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

eon

n.

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
eon
  (ē'ŏn')   
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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