Crossword Genius

Ages upon ages (3)

Ross

I believe the answer is:

eon

'ages upon ages' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for eon that I've seen before include "Age, epoch" , "Immense period" , "Long period of time" , "Vast period" , "Huge time period" .)

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