Crossword Genius

Momentous time period (3)

Ross

I believe the answer is:

era

'momentous time period' 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 "day" , "Age of importance" , "Major division of geological time" , "Period, age" , "Are involved in time span" .)

I've seen this clue in The Washington Post.
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