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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.
1 Ibid. ( 2 abbreviation for the Latin Ibidem, meaning The same). 3  Refers to the same author and source (e.g. , book, journal) in the immediately preceding reference. 4  op. cit. ( 5 abbreviation for the Latin opus citatum, meaning the work cited).6  Refers to the reference listed earlier by the same author. (abbreviation for the Latin Ibidem, meaning The same). 2  Refers to the same author and source (e.g. , book, journal) in the immediately preceding reference. 3  op. cit. ( 4 abbreviation for the Latin opus citatum, meaning the work cited).