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

See also: calibre [Brit, Cdn]

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• Frigid Zone
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• frijol
• frijole
• frijoles refritos
• frijolillo
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• frilled lizard
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• Frimaire
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