What does the word posse mean?

Usage examples for posse

  1. Speed was his best safety now; he pushed on boldly, cheered by the thought that if seen by any of the posse he would be taken for one of their own number. – The Desire of the Moth; and The Come On by Eugene Manlove Rhodes
  2. A cheer came from the posse. – The Untamed by Max Brand
Alphabet: