index - definition in the American English Dictionary - Cambridge Dictionaries Online

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index

noun [C]  us   /ˈɪn·deks/ (plural indexes  /ˈɪnˌdek·səz/ or indices  /ˈɪn·dəˌsiz/ )

index noun [C] (LIST)

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.

index noun [C] (COMPARISON)

a number used to show the value of something by comparing it to something else whose value is known: a wage/price index fig. The rate of consumer spending is often thought to be an index of public confidence (= show the state of the public’s confidence) in the health of the economy.

index

verb [T]  us   /ˈɪn·deks/

index verb [T] (MAKE LIST)

to prepare an index for a book, or to arrange information in an index: He organized and indexed the material by computer.

index verb [T] (MAKE COMPARISON)

to vary a system of numbers against another or against a fixed standard: Social Security payments are indexed to (= adjusted to allow for) inflation every year.
(Definition of index from the Cambridge Academic Content Dictionary © Cambridge University Press)
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