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Search also in: Web News Encyclopedia Images. opus (opuses plural) (opera plural) 1 n-count An opus is a piece of classical music by a particular composer. Opus is usually followed by a number which indicates at what point the piece was written. The abbreviation op. is also used.
Op. cit. is an abbreviation of the Latin phrase opere citato, meaning in the work cited. Contents. Overview. The abbreviation is used in an endnote or footnote to refer the reader to a previously cited work, standing in for repetition of the full title of the work.