Noble period (6)
I believe the answer is:
august
I believe this is a double definition.
'noble' is the first definition.
(similar in meaning)
'period' is the second definition.
(August is an example)
(Other definitions for august that I've seen before include "Venerable; month" , "days in summer" , "Roman emperor's month" , "Gregorian calendar month" , "Grand, lordly" .)