pe ‧ riph ‧ e ‧ ry /pəˈrɪf ə ri/ BrE AmE noun ( plural peripheries ) formal
[ Date: 1500-1600 ; Language: Old French ; Origin: periferie , from Late Latin , from Greek , from peripherein 'to carry around' ]
1 . [countable usually singular] the edge of an area
periphery of
the periphery of the crowd
on/at the periphery
a residential area on the periphery of the city
⇨ ↑ outskirts
2 . on/at the periphery (of something) a person or thing that is on the periphery of something is not one of the main people or things involved in it:
extremists on the periphery of the animal rights movement
Homeopathy is on the periphery of medical practice.