Crossword Genius

Many millennia (4)

Ross

I think it could be either:

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4

4*

aeon

'many millennia' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for aeon that I've seen before include "Indefinitely long period of time" , "A very long time, an age" , "Eternity" , "An age; period" , "Vast age" .)

I've seen this clue in the LA Times and The New York Times.
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