noun

1. An alphabetical listing of items and their location.

   “The index of a book lists words or expressions and the pages of the book upon which they are to be found.”

2. The index finger; the forefinger.

3. A movable finger on a gauge, scale, etc.

Synonyms: manicule

verb

1. To arrange an index for something, especially a long text.

2. To inventory, to take stock.

3. To normalise in order to account for inflation; to correct for inflation by linking to a price index in order to maintain real levels.