1 a list in order from A to Z, usually at the end of a book, of the names or subjects that are referred to in the book （书后的）索引，引得: If you want to find all the references to London, look it up in the index. 查一查索引，你就可以找到关于伦敦的全部参考数据。

2 (Brit 英) =CARD INDEX

3 (plural indexes or indices) a way of showing how the price, value, rate, etc of sth has changed 指数（显示价格、价值、比率等的变动）: the cost-of-living index 生活费用指数 index verbThe books in the library are indexed by subject and title. 图书馆里的书按学科和书名编目录。