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eon definition

eon (ē′ən, ē′än′)

noun

  1. an extremely long, indefinite period of time; thousands and thousands of years
  2. Geol.
    1. the major unit of geologic time, usually subdivided into eras
    2. 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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