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See also: Domain



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



domain (plural domains)

  1. A geographic area owned or controlled by a single person or organization.
    The king ruled his domain harshly.
    • 2020 February 25, Christopher de Bellaigue, “The end of farming?”, in The Guardian[1]:
      Farmers account for just 1.5% of the British population, but the size of their domain – 71% of the country’s surface area is classified as farmland – has given them power over the public imagination.
    • 2022, Behemoth (lyrics and music), “Ov My Herculean Exile”:
      A blinded hermit in oblivion, disgraced / Like Odysseus lost in Poseidon's endless domain / In a realm devoid ov solace, I roam
  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 January, Michael Riordan, “Tackling Infinity”, in American Scientist[2], volume 100, number 1, archived from the original on 30 April 2013, page 86:
      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, set theory) The set of input (argument) values for which a function is defined.
    1. (more generally, of a binary relation R between A and B) The set A; The subset of A consisting of elements a of A such that there exists an element b in B with (a,b) in R.
  5. (mathematics) A ring with no zero divisors; that is, in which no product of nonzero elements is zero.
    Hyponym: integral domain
  6. (mathematics, topology, mathematical 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.
    • 2000, BIND 9 Administrator Reference Manual (9.3.2), Internet Software Consortium [3]
      Every name in the DNS tree is a domain, even if it is terminal, that is, has no 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.
  12. (computing) Such a region used as a data storage element in a bubble memory.
  13. (data processing) A form of technical metadata that represent the type of a data item, its characteristics, name, and usage.
    • a. 2013, IBM, “IBM Terminology - terms D”, in 'IBM Software|Globalization|Terminology'[4], retrieved 2013-12-29:
      A characteristic of a field. A data domain specifies a data type and applies the minimum and maximum values allowed and other constraints.
  14. (taxonomy) The highest rank in the classification of organisms, above kingdom; in the three-domain system, one of the taxa Bacteria, Archaea, or Eukaryota.
  15. (biochemistry) A folded section of a protein molecule that has a discrete function; the equivalent section of a chromosome.
  16. (geology) An area of more or less uniform mineralization.

Usage notes[edit]

  • (collection of information): Used in a context in which domain name services, or kindred 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.



  • (antonym(s) of domain of definition of a function): range
  • (antonym(s) of domain of definition of a function): codomain


Derived terms[edit]

Related terms[edit]


Further reading[edit]



Indonesian Wikipedia has an article on:
Wikipedia id


From English domain, from Middle English demayne, demain (rule), from Old French demeine, demaine, demeigne, domaine (power), (French domaine), from Latin dominium (property, right of ownership), from dominus (master, proprietor, owner). Doublet of dame.


  • IPA(key): [d̪oˈmaɪn]
  • Hyphenation: do‧ma‧in


domain (plural domain-domain, first-person possessive domainku, second-person possessive domainmu, third-person possessive domainnya)

  1. domain
    Synonyms: daerah, ranah, wilayah

Further reading[edit]



domain m (plural domains)

  1. (Internet) domain