[ee-uhn, ee-on]
(in Gnosticism) one of a class of powers or beings conceived as emanating from the Supreme Being and performing various functions in the operations of the universe.

1640–50; < Late Latin < Greek aiṓn space of time, age Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aeon or esp (US) eon (ˈiːən, ˈiːɒn, ˈiːən, ˈiːɒn)
1.  an immeasurably long period of time; age
2.  a period of one thousand million years
3.  (often capital) gnosticism one of the powers emanating from the supreme being and culminating in the demiurge
[C17: from Greek aiōn an infinitely long time]
eon or esp (US) eon
[C17: from Greek aiōn an infinitely long time]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, from L. aeon, from Gk. aion "age, eternity" (see eon).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But his work was about life in the abstract-processes and aeons.
Yeah, they say it hiccupped and got stuck for three or four aeons, then finally
  slipped back into gear.
But half a century, though aeons in computer time, is an instant in the sweep
  of language history.
Moreover, they are happening alarmingly fast-in decades, rather than the aeons
  needed for fish and plants to adapt.
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