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Adjective: .45 calibre
Usage: Brit, Cdn (US: .45 caliber)
  1. Of or relating to the bore of a gun (or its ammunition) that measures forty-five hundredths of an inch in diameter
    "He carried a .45 calibre pistol"; "He carried a .45 calibre pistol";
    - .45 caliber [US], .45-caliber [US], .45-calibre [Brit, Cdn]