Index



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What is an index?



in·dex/ˈinˌdeks/noun
  1. 1.an alphabetical list of names, subjects, etc., with references to the places where they occur, typically found at the end of a book."clear cross references supplemented by a thorough index"
  2. 2.an indicator, sign, or measure of something."exam results may serve as an index of the teacher's effectiveness"
    Similar:
    guide
    clue
    hint
    indication
    indicator
    lead
    sign
    signal
    mark
    evidence
    symptom
    implication
    intimation
    suggestion
verb
  1. 1.record (names, subjects, etc.) in an index."the list indexes theses under regional headings"
  2. 2.link the value of (prices, wages, or other payments) automatically to the value of a price index."legislation indexing wages to prices"


Index (indices) in Maths is the power or exponent which is raised to a number or a variable. For example, in number 24, 4 is the index of 2.
In words, we might say “2 to the power of 4” = 16.


  • Index in a documentAn index is an alphabetical list of topics or subjects in a document, usually found at the end, that includes the page numbers where each topic can be found. It's a navigational tool that helps readers quickly find information, especially in nonfiction books. For example, an index might include names, places, keywords, and major topics.



  • Index in investingAn index is a standardized way to track the performance of a group of assets or stocks, such as a broad-based index or one that tracks a specific sector. Indexes are important in financial markets because they help investors measure performance, understand risk, and guide the development of financial products.


An index is a kind of set. A collection of things that identify and contain something larger than the sum of their parts.