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Domain (plural Domains)
  1. A geographic area owned or controlled by a single person or organization.
  2. A sphere of influence.
  3. A group of related items, topics, or subjects.
  4. (mathematics) The set of all possible mathematical entities (points) where a given function is defined.
  5. (mathematics, topology, analysis) An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers.
  6. (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 [1]
      Every name in the DNS tree is a domain, even if it is terminal, that is, has no subdomains.
  7. (computing, Internet) A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains
  8. (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
  9. (computing) The collection of computers identified by a domain's domain names
  10. (biology, taxonomy) In the three-domain system, the highest rank in the classification of organisms, above kingdom; in other taxonomic systems, a similarly high rank
  11. (biology, taxonomy) In the three-domain system, one of three taxa at that rank: Bacteria, Archaea, or Eukaryota.


  • (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

Derived terms

Related terms

Find words for Domain


temporal; spiritual; allied (pi) ; speckless; ancestral; rough-hewn; extended; unexploited; bleak; ecclesiastical; obscure; shifting; elastic; scanty; shattered; melancholy; eminent; imperial; unassailable; forbidden; flourishing; impenetrable; outlying; allpervading; vast.


academic discipline, academic specialty, acres, ally, ambit, animal kingdom, applied science, archduchy, archdukedom, area, arena, art, bailiwick, beat, body politic, border, borderland, buffer state, captive nation, chain of being, champaign, chattels real, chieftaincy, chieftainry, circle, circuit, city-state, class structure, colony, commonweal, commonwealth, concern, country, county, demesne, department, department of knowledge, discipline, dominion, duchy, dukedom, earldom, empery, empire, establishment, field, field of inquiry, field of study, free city, grand duchy, grounds, hemisphere, hierarchy, honor, judicial circuit, jurisdiction, kingdom, land, landed property, lands, lot, lots, mandant, mandate, mandated territory, mandatee, mandatory, manor, march, messuage, mineral kingdom, nation, nationality, natural hierarchy, natural science, ology, orb, orbit, pale, parcel, pecking order, plat, plot, polis, polity, possession, power, power structure, praedium, precinct, principality, principate, property, protectorate, province, puppet government, puppet regime, pure science, pyramid, quadrat, real estate, real property, realm, realty, republic, round, satellite, science, seneschalty, settlement, social science, sovereign nation, speciality, specialization, specialty, sphere, state, study, subdiscipline, sultanate, superpower, technicology, technics, technology, tenements, terrain, territory, toft, toparchia, toparchy, vegetable kingdom, walk


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



The translations below need to be checked.

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