GNU Collaborative International Dictionary of English
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Found one definition
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‖Opus (?), n.; pl. Opera (#). [L. See Opera.] A work; specif. (Mus.), a musical composition.
[1913 Webster]
☞ Each composition, or set of pieces, as the composer may choose, is called an opus, and they are numbered in the order of their issue. (Often abbrev. to op.)
[1913 Webster]
Opus incertum. [L.] (Arch.) See under Incertum.
[1913 Webster]