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eon

Eon, a variation of aeon, is a unit of geological time equal to a billion years, or a very long period of time. (noun)

  1. An example of an eon is the unit of measure used when talking about how long ago the solar system was created.
  2. An example of an eon is the amount of time since dinosaurs roamed the earth.

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See eon in Webster's New World College Dictionary

See eon in American Heritage Dictionary 4

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