More or less on (5)
I believe the answer is:
about
I believe this is a double definition.
'more or less' is the first definition.
('about' can be a synonym of 'more or less')
'on' is the second definition.
(thesaurus)
(Other definitions for about that I've seen before include "In conection with, all around" , "On the subject of, approximately" , "Almost; around" , "Moving" , "On the topic of" .)