/oh"peuhs/ , n. , pl. opuses or, esp. for 1, 2, opera /oh"peuhr euh, op"euhr euh/ .
1. a musical composition.
2. one of the compositions of a composer, usually numbered according to the order of publication.
3. a literary work or composition, as a book: Have you read her latest opus? Abbr.: op.
[ 1695-1705; ]