Eon

'Eon'

[eon.n.01] as in: the longest division of geological time

'Eon'

[eon.n.02] as in: an immeasurably long period of time

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Examples:
oh, that happened eons ago

'Eon'

[eon.n.03] as in: (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe