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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.
noun outÂ·put \ËauÌt-ËpuÌt\. : the amount of something that is produced by a person or thing. : something (such as power, energy, or information) that is produced by a machine or system. : the place at which information, power, etc., comes out of a machine or system.