Crossword Genius

Eon division (3)

Ross

I believe the answer is:

era

'eon division' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for era that I've seen before include "quite some time" , "Age marked by a distinctive character" , "Aeon" , "Major division of geological time" , "Geological age" .)

I've seen this clue in The Chronicle of Higher Education, the Wall Street Journal and the King Feature Syndicate.
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