Time-period (4)
I believe the answer is:
year
I believe this is a double definition.
'time' is the first definition.
(year is a unit of time)
'period' is the second definition.
(I know that year is a type of period)
(Other definitions for year that I've seen before include "Period of earth's orbit" , "Full calendar?" , "Manage" , "Time period" , "One orbit round the sun" .)