Distinct period of time (5)
I believe the answer is:
epoch
(Other definitions for epoch that I've seen before include "Significant period" , "significant time" , "remarkable time" , "years" , "Geological time period" .)
I believe the answer is:
epoch
(Other definitions for epoch that I've seen before include "Significant period" , "significant time" , "remarkable time" , "years" , "Geological time period" .)