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Noun: posse comitatus
Usage: archaic
  1. A temporary police force
    "The sheriff assembled a posse comitatus to search for the escaped prisoner";
    - posse [archaic]

Derived forms: posse comitatuses

Type of: Bill [Brit, informal], boys in blue [informal], constabulary, fuzz [informal], law, Old Bill [Brit, informal], police, police force, polis [UK, dialect, informal], the fuzz [informal]

Encyclopedia: Posse comitatus