AskDefine | Define domain

Dictionary Definition



1 a particular environment or walk of life; "his social sphere is limited"; "it was a closed area of employment"; "he's out of my orbit" [syn: sphere, area, orbit, field, arena]
2 territory over which rule or control is exercised; "his domain extended into Europe"; "he made it the law of the land" [syn: demesne, land]
3 the set of values of the independent variable for which a function is defined
4 people in general; especially a distinctive group of people with some shared interest; "the Western world" [syn: world]
5 a knowledge domain that you are interested in or are communicating about; "it was a limited domain of discourse"; "here we enter the region of opinion"; "the realm of the occult" [syn: region, realm]

User Contributed Dictionary



demeine, demain (rule), demeine, demaine, demeigne, domaine (power), domaine, from dominium (property, right of ownership), from dominus (master, proprietor, owner). See dame, and confer demain, domain, danger, dungeon.


  • (UK) /dəʊˈmeɪn/, /d@U"meIn/
  • (US) /doʊˈmeɪn/, /doU"meIn/
  • Rhymes: -eɪn


  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. The set of all possible mathematical entities (points) where a given function is defined.
  5. In the context of "computing|Internet": Any DNS domain name, particularly one which has been delegated and has become representative of the delegated domain name and its subdomains
    • BIND 9 Administrator Reference Manual (9.3.2), Copyright © 2004, 2005 Internet Systems Consortium, Inc. ("ISC"), Copyright © 2000-2003 Internet Software Consortium,
      Every name in the DNS tree is a domain, even if it is terminal, that is, has no subdomains.
  6. In the context of "computing|internet": A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains
  7. 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
  8. The collection of computers identified by a domains domain names
  9. In the context of "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
  10. In the context of "biology|taxonomy": In the three-domain system, one of three taxa at that rank: (Bacteria, Archaea, and Eukaryota)

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

Related terms


geographic area
  • Dutch: domein
  • Finnish: alue
  • French: domaine
  • German: Domäne, Gebiet, Bezirk
  • Italian: dominio
  • Polish: dziedzina
  • Portuguese: domínio
  • Spanish: dominio
  • Vietnamese: đất đai, tài sản, dinh cơ
sphere of influence
group of related items
  • Finnish: luokka, laji, suku, ala
  • German: Gebiet, Bereich
  • Polish: dziedzina
  • Portuguese: domínio
(mathematics) set of points
DNS domain name
collection of DNS domain names
  • German: Domains, Domänen
  • Polish: domena
  • Portuguese: domínio
collection of information
  • German: Domain, Domäne, Wissensgebiet
  • Italian: dominio
  • Polish: domena
collection of computers
highest-level grouping of organisms

Extensive Definition

Domain is the distinguished part of an abstract or physical space where something exists, is performed, or valid. For example, we may talk about: domain of interest, domain of activity. This concept is used in every branch/sector/field of human activity.
It also has several meanings:





In mathematics domain can refer to:

Information technology

In information technology, the term domain can refer to:


domain in Catalan: Domini
domain in Danish: Domæne
domain in German: Domäne
domain in Spanish: Dominio
domain in Basque: Domeinu
domain in French: Domaine
domain in Galician: Dominio
domain in Korean: 도메인
domain in Croatian: Domena
domain in Italian: Dominio
domain in Hebrew: תחום
domain in Hungarian: Domén
domain in Dutch: Domein
domain in Japanese: ドメイン
domain in Norwegian: Domene
domain in Norwegian Nynorsk: Domene
domain in Polish: Domena
domain in Portuguese: Domínio (desambiguação)
domain in Russian: Домен
domain in Finnish: Domain
domain in Swedish: Domän
domain in Turkish: Domain
domain in Ukrainian: Домен
domain in Chinese: 域

Synonyms, Antonyms and Related Words

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
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