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aeon

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eons

Main Entry:: ae·on
Variant(s):: or eon \ˈē-ən, ˈē-ˌän\
Function:: noun
Etymology:: Latin, from Greek aiōn — more at aye
Date:: 1647

1: an immeasurably or indefinitely long period of time : age2 ausually eon : a very large division of geologic time usually longer than an era b: a unit of geologic time equal to one billion years

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