• Domain


    • RP IPA: /dəʊˈmeɪn/
    • GenAm IPA: /doʊˈmeɪn/
    • New York dialect IPA: /dəmejn/
    • Rhymes: -eɪn


    From Middle English demeine, demain ("rule"), Old French demeine, demaine, demeigne, domaine ("power"), (French domaine), from Latin dominium ("property, right of ownership"), from dominus ("master, proprietor, owner"). See dame, and confer demain, danger, dungeon.

    Full definition of domain



    (plural domains)
    1. A geographic area owned or controlled by a single person or organization.The king ruled his domain harshly.
    2. A field or sphere of activity, influence or expertise.Dealing with complaints isn't really my domain: get in touch with customer services.His domain is English history.
    3. A group of related items, topics, or subjects.
      • 2012-01, Michael Riordan, Tackling Infinity, Some of the most beautiful and thus appealing physical theories, including quantum electrodynamics and quantum gravity, have been dogged for decades by infinities that erupt when theorists try to prod their calculations into new domains. Getting rid of these nagging infinities has probably occupied far more effort than was spent in originating the theories.
    4. (mathematics) The set of all possible mathematical entities (points) where a given function is defined.
    5. (mathematics) A ring with no zero divisors; that is, in which no product of nonzero elements is zero.
    6. (mathematics, topology, analysis) An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers.
    7. (computing, Internet) Any DNS domain name, particularly one which has been delegated and has become representative of the delegated domain name and its subdomains
    8. (computing, Internet) A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains
    9. (computing) A collection of information having to do with a domain, the computers named in the domain, and the network on which the computers named in the domain reside
    10. (computing) The collection of computers identified by a domain's domain names
    11. (physics) A small region of a magnetic material with a consistent magnetization direction; such a region used as a data storage element in a bubble memory
    12. (data processing) a form of technical metadata that represent the type of a data item, its characteristics, name, and usage
      • A characteristic of a field. A data domain specifies a data type and applies the minimum and maximum values allowed and other constraints.
    13. (biology, taxonomy) The highest rank in the classification of organisms, above kingdom; in the three-domain system, one of the taxa Bacteria, Archaea, or Eukaryota.
    14. (biochemistry) A folded section of a protein molecule that has a discrete function

    Usage notes

    (collection of information) Used in a context in which domain name services, or domain name like services, are managed in a fashion that is integrated with the management of other computer and network related information.

    (collection of computers) Used in the same context as the collection of information domain sense.



    • (domain of definition of a function) range
    • (domain of definition of a function) codomain


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