Dictionary > English Dictionary > Definition, synonym and antonym of index
Meaning of index by Wiktionary Dictionary



    From Latin index ( “a discoverer, informer, spy; of things, an indicator, the forefinger, a title, superscription” ), from indicō ( “point out, show” ); see indicate .


    • IPA: /ˈɪndɛks/


    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. The index finger, the forefinger, or other pointer .
    3. A sign; an indication; a token .
      His son's empty guffaws ... struck him with pain as the indices of a weak mind .
    4. ( 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 .
    5. ( economics ) A single number calculated from an array of prices or of quantities .
    6. ( sciences ) A number representing a property or ratio, a coefficient .
    7. ( mathematics ) A raised suffix indicating a power .
    8. ( programming, computing ) An integer or other key indicating the location of data e.g. within a vector, database table, associative array, or hash table .
    9. ( computing, databases ) A data structure that improves the performance of operations on a table .


    Derived terms

    See also

    • Oxford English Dictionary, Second Edition, 1989

    See also


    index ( third-person singular simple present indexes present participle indexing, simple past and past participle indexed )

    1. ( transitive ) To arrange an index for something, especially a long text .
    2. To inventory, to take stock .

    Derived terms

    External links

    • index in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
    • index in The Century Dictionary, The Century Co., New York, 1911


    • nixed

Explanation of index by Wordnet Dictionary


    1. adjust through indexation

    2. The government indexes wages and prices
    3. provide with an index

    4. index the book
    5. list in an index

    1. the finger next to the thumb

    2. an alphabetical listing of names and topics along with page numbers where they are discussed

    3. a number or ratio ( a value on a scale of measurement ) derived from a series of observed facts

    4. a mathematical notation indicating the number of times a quantity is multiplied by itself

    5. a numerical scale used to compare variables with one another or with some reference number