From Latin index, from indicō; see indicate.

• IPA: /ˈɪndɛks/

index

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.

   Synonyms: Thesaurus:index finger

3. A movable finger on a gauge, scale, etc.
4. (typography) A symbol resembling a pointing hand, used to direct particular attention to a note or paragraph.

   Synonyms: manicule

5. That which points out; that which shows, indicates, manifests, or discloses.
   • 1731, John Arbuthnot, An Essay Concerning the Nature of Aliments, and the Choice of Them, According to the Different Constitutions of Human Bodies. […], 1st Irish edition, Dublin: […] S. Powell, for George Risk, […], George Ewing, […], and William Smith, […], →OCLC ↗:

     Tastes are the Indexes of the different Qualities of Plants.

6. A sign; an indication; a token.
   • 1887, Robert Louis Stevenson, The Misadventures of John Nicholson:

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

7. (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.
8. (economics) A single number calculated from an array of prices or of quantities.
9. (science) A number representing a property or ratio; a coefficient.
10. (mathematics) A raised suffix indicating a power.
11. (computing, especially, programming and databases) An integer or other key indicating the location of data, e.g. within an array, vector, database table, associative array, or hash table.
12. (computing, databases) A data structure that improves the performance of operations on a table.
13. (algebra, index of a subgroup) The number of cosets that exist.

    The index of 2ℤ in ℤ is 2.

14. (obsolete) A prologue indicating what follows.
    • c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act III, scene iv]:

      Ay me, what act, that roars so loud and thunders in the index?

• French: index
• German: Index, Verzeichnis
• Italian: indice
• Portuguese: índice
• Russian: указа́тель
• Spanish: índice

• Russian: показа́тель

• French: indice
• Italian: indice
• Russian: и́ндекс

• Russian: коэффицие́нт

• Portuguese: expoente
• Russian: показатель степени

• Russian: и́ндекс

• German: Index
• Russian: и́ндекс

index (indexes, present participle indexing; simple past and past participle indexed)

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

   MySQL does not index short words and common words.

2. To inventory; to take stock.
3. (chiefly, economics) To normalise in order to account for inflation; to correct for inflation by linking to a price index in order to maintain real levels.
4. To measure by an associated value.
5. (linguistics, transitive) To be indexical for (some situation or state of affairs); to indicate.
6. (computing) To access a value in a data container by an index.

• French: indexer
• German: indizieren
• Italian: indicizzare
• Portuguese: indexar
• Russian: индекси́ровать
• Spanish: indizar, indexar

1. An unincorporated community in Miller County, Arkansas.
2. An unincorporated community in Morgan County, Kentucky.
3. A ghost town in Cass County, Missouri.
4. A small hamlet in Otsego County, New York.
5. An unincorporated community in King George County, Virginia.
6. A town in Snohomish County, Washington.
7. An unincorporated community in Gilmer County, West Virginia.