Monarch's reign, e.g (3)
I believe the answer is:
era
(Other definitions for era that I've seen before include "Special time" , "Geological age" , "Aeon" , "quite some time" , "Major division of geological time" .)
I believe the answer is:
era
(Other definitions for era that I've seen before include "Special time" , "Geological age" , "Aeon" , "quite some time" , "Major division of geological time" .)