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noun (plural opuses or opera /ˈäp(ə)rə/)
- 1 Music a separate composition or set of compositions by a particular composer, usually ordered by date of publication:The Gambler was Prokofiev’s sixth opera, despite its early opus numberSee also Op.
early 18th century: from Latin, literally 'work'
The plural of opus can be spelled either opuses or opera (like the original Latin).