eon

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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

eon

(ˈiːən; ˈiːɒn)
n
the usual US spelling of aeon
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

e•on

or ae•on

(ˈi ən, ˈi ɒn)

n.
1. an indefinitely long period of time; age.
2. the largest division of geologic time, comprising two or more eras.
3. one billion years.
[1640–50; < Late Latin aeōn < Greek aiṓn space of time, age]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

e·on

(ē′ŏn′)
The longest division of geologic time, containing two or more eras.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.eon - the longest division of geological time
geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
geological era, era - a major division of geological time; an era is usually divided into two or more periods
2.eon - an immeasurably long period of time; "oh, that happened eons ago"
long time, years, age - a prolonged period of time; "we've known each other for ages"; "I haven't been there for years and years"
3.eon - (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
Gnosticism - a religious orientation advocating gnosis as the way to release a person's spiritual element; considered heresy by Christian churches
spiritual being, supernatural being - an incorporeal being believed to have powers to affect the course of human events
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

eon

also aeon
noun
A long time:
eternity, long, year (used in plural).
Informal: age (used in plural), blue moon.
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.