American Dictionary

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Definition index in American English

index noun

[countable] noun
/ˈɪnˌdeks/
1

an alphabetical list of something such as subjects or names at the back of a book, that shows on which page they are mentioned

Example

Look up the term you want in the index.

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2

a number that shows the price, value, or level of something compared with something else

Example

The Dow Jones index fell another 50 points yesterday.

Example

a wage/price index

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3

something that can be used for measuring how a situation is changing

Example

The test provides parents with a reliable index of their child's progress.

Synonyms and related words
Definition index in American English