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English definition of “index”

index

noun [C] (LIST)   /ˈɪn·deks/ (plural indexes  /ˈɪnˌdek·səz/ or indices  /ˈɪn·dəˌsiz/)
writing an alphabetical list, such as one printed at the back of a book showing on which page a name or subject appears, or computer information ordered in a particular way: If you want to find the place in the text that Henry James is mentioned, look it up in the index.
(Definition of index noun (LIST) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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