名词
1. （按创作的先后次序排列的某一作曲家的）编号作品（缩略形式为op.）
An opus is a piece of classical music by a particular composer. Opus is usually followed by a number which indicates at what point the piece was written. The abbreviation op. is also used.
2. 艺术作品；乐曲；著作；画作
You can refer to an artistic work such as a piece of music or writing or a painting as an opus .
1. a musical work that has been created
e.g. the composition is written in four movements