Definition of Posse Comitatus Act in English:

Posse Comitatus Act

Pronunciation /ˌpäsē ˌkämiˈtādəs ˌakt/ /ˌpɑsi ˌkɑmɪˈteɪdəs ˌækt/


  • A federal statute prohibiting use of the military in civilian law enforcement.

    ‘The DOD, however, claimed to base its policy upon the Posse Comitatus Act.’
    • ‘The Democrats made absolutely no mention of the Posse Comitatus Act.’
    • ‘Legal barriers to sending the armed forces into U.S. streets have existed for more than a century under the Posse Comitatus Act.’
    • ‘In many respects, the Posse Comitatus Act remained invisible for the first several decades of the 20th century.’
    • ‘Clearly, the Posse Comitatus Act did not originate from the prevailing opinion during the revolutionary period.’


Latin posse comitatus ‘power of the county’.