n.

1. 一队；一团；一群
2. 【美】（由地方治安官召集的）地方治安维持队；民团

n.

1. N. Amer. historical a body of men summoned by a sheriff to enforce the law.
2. (also posse comitatus /ˌkɒmɪˈteɪtəs/ ) Brit. historical the body of men above the age of fifteen in a county, whom the sheriff could summon to repress a riot or for other purposes. [comitatus from med. L., ‘of the county’.]
3. informal a group of people with a common characteristic, interest, or purpose.