Noun

Singular domain

Plural domains

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. (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.

6. (computing, Internet) A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains
7. (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
8. (computing) The collection of computers identified by a domain's domain names
9. (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. (biology, taxonomy) In the three-domain system, one of three taxa at that rank: Bacteria, Archaea, or Eukaryota.

Domain may refer to:

General

• some kind of territory (country subdivision), such as a demesne or a realm
• a field of study
• public domain, a body of works and knowledge without proprietary interest
• eminent domain, the power of government to confiscate private property for public use

Places

• The Domain (Austin), a shopping mall in Austin, Texas, USA
• in several Commonwealth of Nations countries, the name for parkland made available for public use by the monarch or their representative, the Governor. Examples include:
  • The Domain, Sydney: a large open space near the central business district of Sydney, Australia
  • Kings Domain, Melbourne in Victoria, Australia
  • Auckland Domain: a large inner-city park in Auckland, New Zealand