theme/θim; θiːm/n [C]1 the main subject or idea in a book, film, discussion etc〔书﹑电影﹑讨论等的〕主题: +of Love is the main theme of the book. 爱是这本书的主题。Education has become a central theme of this election campaign. 教育问题已经成了这次竞选活动的中心主题。2 theme music/song/tune music that is always played with a particular television or radio programme 主题音乐/主题歌/主题曲