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English Dictionary

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 .45-caliber .45-caliber /ˌdɒt ˈfɔːrtiˈfaɪv-ˈkælɪbər/

adjective

  1. [American] Of or relating to the bore of a gun (or its ammunition) that measures forty-five hundredths of an inch in diameter  ( .45 caliber [American] , .45 calibre [Canadian, British] , .45-caliber [American] , .45-calibre [Canadian, British] )
    of or relating to the bore of a gun (or its ammunition) that measures forty-five hundredths of an inch in diameter