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Domain may refer to:

  • Domain (taxonomy), a taxonomic subdivision larger than a kingdom
  • Domain name, the name of a realm of administrative autonomy, authority, or control on the Internet
  • Magnetic domain (physics), a region within a magnetic material which has uniform magnetization
  • High-field domain (physics) in semiconductors, also called Böer domain
  • Protein domain (biology), a part of a protein that can exist independently of the rest of the protein chain
  • Territory (subdivision), a non-sovereign geographic area which has come under the authority of another government
  • Demesne, in English common law and other Medieval European contexts, lands directly managed by their holder rather than being delegated to subordinate managers
  • Domain Group, one of the two major real estate marketing portals in Australia
  • The domain of discourse in logic is the collection of entities of interest in logical analysis
  • Domain (sociolinguistics), the situations in which a language is used, for instance, in formal education, at home, or by a government.

Information technology[edit]

  • Administrative domain
  • Domain (software engineering), a field of study that defines a set of common requirements, terminology, and functionality for any software program constructed to solve a problem in a given field
    • Application domain, a mechanism used within a Common Language Infrastructure to isolate executed software applications from one another
  • Broadcast domain, in computer networking, a group of special-purpose addresses to receive network announcements
  • Network domain, a named grouping of hosts and servers with managed login, access to resources, and permissions.


  • Domain of a function, the set of input values for which the function is defined
  • Domain of discourse, the set of entities over which logic variables may range
  • Domain (mathematical analysis), an open connected set
  • Domain (ring theory), a nontrivial ring without left or right zero divisors
    • Integral domain, a non-trivial commutative ring without zero divisors
      • Atomic domain, an integral domain in which every non-zero non-unit is a finite product of irreducible elements
      • Bézout domain, an integral domain in which the sum of two principal ideals is again a principal ideal
      • Euclidean domain, an integral domain which allows a suitable generalization of the Euclidean algorithm
      • Dedekind domain, an integral domain in which every nonzero proper ideal factors into a product of prime ideals
      • GCD domain, an integral domain in which every two non-zero elements have a greatest common divisor
      • Principal ideal domain, an integral domain in which every ideal is principal
      • Unique factorization domain, an integral domain in which every non-zero element can be written as a product of irreducible elements in essentially a unique way
  • Frequency domain, the analysis of mathematical functions with respect to frequency, rather than time
  • Fundamental domain, a symmetry group of an object is a part or pattern, as small or irredundant as possible, which determines the whole object based on the symmetry
  • Time domain, the analysis of mathematical functions with respect to time
  • Domain theory, studying certain kinds of partial ordered sets


Australian Public Domains[edit]

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:

New Zealand Public Domains[edit]

As per Public Domains Act 1860 (24 Victoriae 1860 No 32). Examples include: