Crossword Genius

Exceedingly long time (3)

Ross

I believe the answer is:

eon

'exceedingly long time' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eon that I've seen before include "Huge time period" , "thousand million years" , "billion years" , "Very long period (US and technical spelling)" , "Very long age" .)

I've seen this clue in the Newsday.
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