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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
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for eon

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 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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eon 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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4
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