# Domain

A domain is a geographic area controlled by a single person or organization. Domain may also refer to:

## Law and human geography

* Demesne, in English common law and other Medieval European contexts, lands directly managed by their holder rather than being delegated to subordinate managers
* Domaine, a large parcel of land under single ownership, which would historically generate income for its owner.
* Eminent domain, the right of a government to appropriate another person's property for public use
* Private domain / Public domain, places defined under Jewish law where it is either permitted or forbidden to move objects on the Sabbath day
* Public domain, creative work to which no exclusive intellectual property rights apply
* Territory (subdivision), a non-sovereign geographic area which has come under the authority of another government

## Science

* Domain (biology), a taxonomic subdivision larger than a kingdom
* Domain of discourse, the collection of entities of interest in logical analysis
* High-field domain (physics) in semiconductors, also called Böer domain
* Knowledge domain, knowledge within a certain discipline, often formalized as a terminology
* Magnetic domain (physics), a region within a magnetic material which has uniform magnetization
* Protein domain (biology), a part of a protein that can exist independently of the rest of the protein chain
* Social domain, a concept in sociology

## Mathematics

* Domain (mathematical analysis), an open connected set
* Domain (ring theory), a non-trivial ring without left or right nonzero zero divisors
** Integral domain, a non-trivial commutative ring without nonzero zero divisors
*** Atomic domain, an integral domain in which every nonzero 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
* Domain of a function, the set of input values for which the (total) function is defined
** Domain of definition of a partial function
** Natural domain of a partial function
** Domain of holomorphy of a function
* Domain of an algebraic structure, the set on which the algebraic structure is defined
* Domain of discourse, the set of entities over which logic variables may range
* Domain theory, the study of certain subsets of continuous lattices that provided the first denotational semantics of the lambda calculus
* Frequency domain, the analysis of mathematical functions with respect to frequency, rather than time
* Fundamental domain, subset of a space that contains exactly one point from each orbit of the action of a symmetry group
* Time domain, the analysis of mathematical functions with respect to time

## Information technology

* Administrative domain
* Broadcast domain, in computer networking, a group of special-purpose addresses to receive network announcements
* Collision 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
** Programming domain, a set of programming languages or programming environments that were engineered specifically for a particular domain (software engineering)
* Network domain, a named grouping of hosts and servers with managed login, access to resources, and permissions.
** Domain name, a label that identifies a realm of administrative autonomy, authority, or control within the Internet
* Attribute domain, the set of values allowed in an attribute.

## Places

* The Domain (Austin, Texas), a shopping mall in Austin, Texas, United States
* Domain (Hong Kong shopping centre), a shopping mall in Yau Tong, Kowloon, Hong Kong
* Domain, Manitoba, a hamlet in Manitoba, Canada
* Domain Precinct, a part of South Yarra in Melbourne, Victoria, Australia

### Australian public domains

* The Domain, Sydney, a large open space near the central business district of Sydney
* Kings Domain, Melbourne, Victoria
* Queens Domain, Hobart, Tasmania

### New Zealand public domains

* Auckland Domain: a large inner-city park in Auckland
* One Tree Hill Domain in Auckland
* Mount Eden Domain in Auckland
* Mount Smart Domain in Auckland
* Mangere Domain in Mangere
* Hamilton Lake Domain in Hamilton
* Taumarunui Domain in Taumarunui
* Ashburton Domain in Canterbury
* Ocean Beach Domain in Dunedin

## Entertainment
### Film

* Domain (2009 film), a French film
* Domain (2016 film), an American film
* The Domain (film), a 2019 Portuguese film

### Music

* "Domain", track by John Carpenter from Lost Themes
* "Domain", a song by KSI from the 2020 album Dissimulation

## Other uses

* Domain, or battlespace, a concept in military operations dividing operating environments into defined components
* Domain Group, an Australian real estate marketing portal, owner of the brand domain.com.au and others