index

noun

1. 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.

   He isn't able to find the index of the book.

2. 2

   The index finger; the forefinger.

3. 3

   A movable finger on a gauge, scale, etc.

4. 4

   A symbol resembling a pointing hand, used to direct particular attention to a note or paragraph.

5. 5

   That which points out; that which shows, indicates, manifests, or discloses.

   Among the gravity indexes is the severance of diplomatic relations.

6. 6

   A sign; an indication; a token.

7. 7

   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.

8. 8

   A single number calculated from an array of prices or of quantities.

9. 9

   A number representing a property or ratio; a coefficient.

10. 10

    A raised suffix indicating a power.

11. 11

    An integer or other key indicating the location of data, e.g. within an array, vector, database table, associative array, or hash table.

12. 12

    A data structure that improves the performance of operations on a table.