作さく品ひん番ばん号ごう

noun

opus number

Used in classical music to refer to the chronological numbering of a composer's works, often abbreviated as Op.

• ベートーヴェンの作さく品ひん番ばん号ごう27の第だい2楽がく章しょうは「月げっ光こう」として知しられている。

  The second movement of Beethoven's Opus 27 is known as the 'Moonlight'.