Noun

Singular index

Plural indexes or indices

index (plural indexes or indices)

1. An alphabetical listing of items and their location; for example, the index of a book lists words or expressions and the pages of the book upon which they are to be found.
2. (linguistics) A type of noun where the meaning of the form changes with respect to the context. E.g., 'Today's newspaper' is an indexical form since its referent will differ depending on the context. See also icon and symbol.
3. The index finger, the forefinger.
4. A sign; an indication; a token.

   His son's empty guffaws ... struck him with pain as the indices of a weak mind.

5. (economics) a single number calculated from an array of prices or of quantities.
6. (programming, computing) An integer or other key indicating the location of data e.g. within a