Crossword Genius

Vast age (4)

Ross

I believe the answer is:

aeon

'vast age' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for aeon that I've seen before include "Immeasurably long period of time" , "Longest division of geological time" , "Eternity" , "Vast time period" , "Very long and indefinite period of time" .)

I've seen this clue in the Sydney Morning Herald and The Telegraph.
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