index

/'indeks/
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index

A student points to a word in the dictionary with her index finger.

Definition

  1. Noun:

    • The finger next to the thumb: The finger used for pointing.
    • An alphabetical listing: A list, usually at the end of a book, of names, subjects, etc., with the page numbers where they can be found.
    • A mathematical notation: A small number written above and to the right of another number, showing how many times that number is to be multiplied by itself (e.g., in 5³, 3 is the index).
    • A number or ratio representing a measurement: A figure that shows the level of something compared to a standard or previous level, often used in economics or science.
    • A numerical scale: A system for comparing different values against a fixed point.

  2. Verb:

    • To adjust according to an index: To link the level of something (like wages or prices) to changes in a standard index.
    • To provide with an index: To compile an alphabetical list for a book or collection of information.
    • To list in an index: To include an item in such a list.
Usage Examples

  • Noun:

    • He pointed at the map with his index.
    • Look up 'photosynthesis' in the book's index to find the correct page.
    • In the equation x², the index is 2.
    • The consumer price index is a key economic indicator.
    • The Dow Jones index tracks the performance of major US companies.

  • Verb:

    • Pensions are indexed to inflation.
    • The librarian will index all the new journals this month.
    • That important concept is indexed under several different terms.
Advanced Usage
  • "To index against": To adjust a value in relation to changes in another specified index.
    • The contract states that the rent will be indexed against the cost of living.
Variants and Related Words
  • Indexation (n): The process of adjusting wages, taxes, etc., according to changes in a price index.
  • Indexer (n): A person or program that creates an index.
  • Indexical (adj): Having the nature of an index or sign.
  • Index finger (n): Another term for the index.
Synonyms
  • Noun: Indicator, gauge, guide, listing, catalog, exponent (mathematical).
  • Verb: Catalog, list, record, adjust, link.
Related Phrases (Phrasal Verbs)
  • Index to: To make an index that refers to a particular thing.
    • The database is indexed to the author's last name.
Related Idioms
  • A sure index of: A reliable sign or indicator of something.
    • His nervousness was a sure index of his guilt.
index

A student points to a word in the dictionary with her index finger.

Noun
  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 mathematical notation indicating the number of times a quantity is multiplied by itself
  4. a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
  5. a numerical scale used to compare variables with one another or with some reference number
Verb
  1. adjust through indexation
    • The government indexes wages and prices
  2. provide with an index
    • index the book
  3. list in an index

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