1 [U] the parts that form sth; the way in which the parts of sth are arranged 组成部份；构造: the chemical composition of a substance 某种物质的化学成分the composition of the population 人口结构

2 [C] a piece of music that has been written by sb 音乐作品: Chopin's best-known compositions 肖邦最著名的作品

3 [U] the act or skill of writing a piece of music or text 作曲；撰文；作曲或撰文的技巧: She studied both musical theory and composition. 她修读了音乐理论及作曲技巧。

4 [C] a short piece of writing done at school, in an exam, etc 作文: Write a composition of about 300 words on one of the following subjects. 试选以下其中一个题目写一篇约300字的文章。