- (abbreviation op.)
a piece of music written by a famous composer and usually followed by a number that shows when it was written （按作曲家的创作时间排列的）编号乐曲 Beethoven’s Opus 18 贝多芬第十八号作品
- (formal)
an important piece of literature, etc., especially one that is on a large scale 主要（文学等）作品；（尤指）大作，巨著
Word Originearly 18th cent.: from Latin, literally ‘work’.