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English definition of “op. cit.”

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op. cit.

adverb uk   /ˌɒpˈsɪt/ us    /ˌɑːp-/ formal abbreviation
used by writers to avoid repeating the details of a book or article that has already been referred to: Johnson (op. cit., page 53) calls this phenomenon "the principle of minimal effort".
(Definition of op. cit. from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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