posse
n. countable C1 Advanced US //ˈpɑsi// UK //pˈɒsi// posse
n. a group of friends who spend a lot of time together. It can also mean a group of people who are helping a leader or a police officer.
n. a group of people who accompany a person, often for protection or social status; historically, a body of men summoned by a sheriff to assist in law enforcement.
He arrived at the party with his whole posse.
The pop star never travels alone, usually surrounded by a posse of bodyguards and assistants.
Ellipsis of posse comitatus.
Usage
Often used with a possessive pronoun ('my posse', 'his posse') to indicate a personal social group.