Crossword Genius

Historical time span (3)

Ross

I believe the answer is:

era

'historical time span' 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 "Significant time" , "Long historic period" , "Geological period" , "Period, age" , "Special time" .)

I've seen this clue in The New York Times, the Universal and the USA Today.
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