Meaning of “.45” in the English Dictionary

british dictionary

".45" in British English

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.45noun [ C ]

uk /ˌfɔː.tiˈfaɪv/ us /ˌfɔːr.t̬iˈfaɪv/

a large type of pistol (= small gun)

(Definition of “.45” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)