オーパスMeanings1nounopusmusicUsed in classical music to refer to a numbered work or composition, often with an opus number.See also: オプスベートーヴェンのオーパス27の第だい2番ばんは「月げっ光こう」として知しられている。Beethoven's Opus 27, No. 2 is known as the 'Moonlight' Sonata.
