Seemingly interminable periods (4)
I believe the answer is:
eons
(Other definitions for eons that I've seen before include "Endless periods" , "Very long periods (US)" , "Times" , "Nose (anag)" , "Divisions of geological time" .)
I believe the answer is:
eons
(Other definitions for eons that I've seen before include "Endless periods" , "Very long periods (US)" , "Times" , "Nose (anag)" , "Divisions of geological time" .)