eon
eon definition
eon (ē′ən, ē′än′)
noun
- an extremely long, indefinite period of time; thousands and thousands of years
- Geol.
- the major unit of geologic time, usually subdivided into eras
- a billion years
Etymology: LL < Gr aiōn, an age, lifetime, eternity < IE base *aiw-, vitality: see aye
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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