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eon

 - 3 dictionary results

e⋅on

[ee-uhn, ee-on]
–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.
Also, aeon.


Origin:
see aeon
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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e·on also ae·on   (ē'ŏn', ē'ən)   
n.  
  1. An indefinitely long period of time; an age.

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


[Late Latin aeōn, from Greek aiōn; see aiw- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

eon 
1647, from L. æon, from Gk. aion "age, vital force, lifetime," from PIE base *aiw- "vital force, life, long life, eternity" (cf. Skt. ayu "life," Avestan ayu "age," L. aevum "space of time, eternity," Goth. aiws "age, eternity," O.N. ævi "lifetime," Ger. ewig "everlasting," O.E. a "ever, always").
Online Etymology Dictionary, © 2001 Douglas Harper
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