Definition of forty-five in English:



  • 1A record played at 45 rpm; a single.

    • ‘The case was full of seventy-eights and forty-fives, about a hundred of them.’
  • 2US A 45-calibre revolver.

    • ‘You can use a variety of weapons, such as forty-fives, machine guns, sniper rifles, shotguns, or a tranquilizer pistol, and you'll frequently have backup from CPU allies who can really take care of themselves.’
    • ‘Although its motivation is unclear, Peter P. Gillis notes that the change of caliber is an anomaly - all forty-fives are six shooters.’


  • the Forty-five

    • An informal name for the Jacobite rebellion of 1745.