Full circle (5)
I believe the answer is:
round
I believe this is a double definition.
'full' is the first definition.
(thesaurus)
'circle' is the second definition.
('round' can be a synonym of 'circle')
(Other definitions for round that I've seen before include "Lap" , "Encircling" , "Circular - stage" , "rung of the ladder" , "Globular" .)