Definition of posse noun from the Oxford Advanced Learner's Dictionary

     

    posse

     noun
    noun
    BrE BrE//ˈpɒsi//
     
    ; NAmE NAmE//ˈpɑːsi//
     
     
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  1. 1(informal) a group of people who are similar in some way, or who spend time together a little posse of helpers He was sat at a corner table and surrounded by a posse of attentive waiters. She arrived at the theatre followed by the usual press posse.
  2. 2(in the US in the past) a group of people who were brought together by a sheriff (= an officer of the law) in order to help him catch a criminal
  3. 3(informal) a group of young men involved in crime connected with drugs
  4. Word Origin mid 17th cent.: from medieval Latin, literally ‘power’, from Latin posse ‘be able’.
See the Oxford Advanced American Dictionary entry: posse