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)
- An example of an eon is the unit of measure used when talking about how long ago the solar system was created.
- 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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