Time line period (3)
I believe the answer is:
era
(Other definitions for era that I've seen before include "Long period of history" , "Eon" , "Stage" , "Memorable period" , "Important historical period" .)
I believe the answer is:
era
(Other definitions for era that I've seen before include "Long period of history" , "Eon" , "Stage" , "Memorable period" , "Important historical period" .)