Crossword Genius

Paleozoic, e.g. (3)

Ross

I believe the answer is:

era

(Other definitions for era that I've seen before include "Age marked by a distinctive character" , "Important historical period" , "Memorable period" , "Series of years" , "Significant time" .)

I've seen this clue in the Penny Press, The New York Times and The Wall Street Journal.
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