Crossword Genius

Very long time period (3)

Ross

I believe the answer is:

eon

'very long time period' 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 "Immense period" , "Long period of time" , "Very long period (US and technical spelling)" , "Vast age; eternity" , "Huge time period" .)

I've seen this clue in the Newsday.com, the Newsday, the USA Today, the King Feature Syndicate and the Family Time.
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