2 entries found for
aeon.
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Main Entry:
aeˇon 
Variant(s):
or eon /

-
n, 
-
än/
Function:
noun
1 : a very long period of time
: AGE2 a usually 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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aeon."