Index
What is an index?
in·dex/ˈinˌdeks/noun
- 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.an indicator, sign, or measure of something."exam results may serve as an index of the teacher's effectiveness"Similar:guidecluehintindicationindicatorleadsignsignalmarkevidencesymptomimplicationintimationsuggestion
- 1.record (names, subjects, etc.) in an index."the list indexes theses under regional headings"
- 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.