Meaning of “op. cit.” in the English Dictionary

british dictionary

"op. cit." in British English

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op. cit.adverb

uk /ˌɒp ˈsɪt/ us /ˌɑːp ˈsɪt/ formal specialized

used by writers to avoid repeating the details of a book or article that has already been referred to, when all the details other than the page number are the same:

Johnson (op. cit., page 53) calls this phenomenon "the principle of minimal effort".
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(Definition of “op. cit.” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)