Crossword Genius

Period in history (3)

Ross

I believe the answer is:

era

'period in history' 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 "Distinct period in history" , "quite some time" , "Geological period" , "Geological age" , "Memorable period" .)

I've seen this clue in the Universal, The Star Tribune, the Penny Press, The Wall Street Journal and The Telegraph.
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