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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.
opera. 1  opera-Actually the Latin plural of opus, labor, work.. 2  prima donna-Meaning principal female singer in an opera, it is from the same Italian phrase meaning first lady; the meaning temperamental person was first recorded in 1834. 3  primo vomo-The principal male singer in an opera.