pos ‧ se /ˈpɒsi $ ˈpɑːsi/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Language: Medieval Latin ; Origin: posse comitatus 'power of the county' ]
1 . informal a group of the same kind of people
posse of
I was surrounded by a posse of photographers.
2 . a group of men gathered together by a ↑ sheriff (=local law officer) in the US in past times to help catch a criminal
3 . American English informal
a) someone’s group of friends – used especially by young people
b) a group of friends from a particular place who share an interest in ↑ rap , HIP-HOP , or ↑ house music SYN massive British English