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

• Territory (administrative division), a non-sovereign geographic area which has come under the authority of another government
• Public domain, a body of works and knowledge without proprietary interest
• Eminent domain, the power of government to confiscate private property for public use

Sciences

• Atomic domain, a domain whose elements are classified as indivisible units
• Domain (biology), a subdivision even larger than a kingdom
• Domain knowledge, a specific expert knowledge valid for a pre-selected area of activity, such as surgery
• Domain specificity, a theoretical position arguing that many aspects of cognition are supported by specialized learning devices
• Domain wall, a term used in physics which can have one of two distinct but similar meanings in either magnetism or string theory
• Magnetic domain, a region within a magnetic material which has uniform magnetization
• Problem domain, the area of expertise or application that needs to be examined to solve a problem
• Protein domain, an autonomously folding functional module of a protein
• Three-domain system, a biology classification that divides cellular life forms into archaea, bacteria, and eukaryote domains

Information technology

• Application domain, the kinds of purposes for which users use a software system
• Broadcast domain, in computer networking, a group of special purpose addresses to receive network announcements
• Clock domain crossing, when a signal crosses from one clock domain into another
• CLR application domain, a mechanism for separating executed applications (similar to a process)
• Collision domain, a physical network segment that is a shared medium where data packets can "collide" with one another
• Data domain, in database theory, a set of all permitted values
• 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 that field
• Domain analysis, the process of analyzing related software systems in a domain to find their common and variable parts
• Domain-driven design, an approach to the design of software
• Domain engineering, the reusing of domain knowledge in the production of new software
• Domain hack, a domain name that combines domain levels to spell out the full "name" or title of the domain
• Domain information groper a tool that queries DNS servers for any desired DNS records
• Domain model, a conceptual model of a system that describes the various entities involved and their relationships
• Domain name registrar, an organization that manages the reservation of Internet domain names in one or more domains
• Domain name registry, a database of all domain names registered in a top-level domain
• Domain name, a common network name under which a collection of network devices are organized (e.g., example.com)
• Domain Name System (DNS), an hierarchical naming system for computers or any resource connected to the Internet
• Domain privacy, a service that replaces the user's information in the WHOIS directory with the information of a forwarding service
• Domain-specific language, a programming language or specification language dedicated to a particular problem domain
• Domain-specific modeling, a software engineering methodology that uses a graphical domain-specific language
• Domain/OS, a workstation operating system
• Full Domain Hash, an RSA-based signature scheme that follows the hash-and-sign paradigm
• Second-level domain, a domain that is directly below a top-level domain
• Top-level domain one of the domains at the highest level in the hierarchical Domain Name System of the Internet
• Windows Server domain, a centrally-managed group of computers using the Windows operating-system
  • Domain controller a server that responds to security authentication requests within the Windows Server domain
  • Backup Domain Controller, a Windows NT 4 server that has a backup copy of the user accounts database
  • Primary Domain Controller, a pre-Windows 2000 NT server with the master copy of the user accounts database

Mathematics

• Domain (ring theory), a nontrivial ring without left or right zero divisors
  • Euclidean domain, a ring that can be endowed with a certain structure – namely a Euclidean function
  • Integral domain, a commutative ring without zero divisors and with a multiplicative identity 1 not equal to 0, the additive identity
  • Dedekind domain, an integral domain in which every nonzero proper ideal factors into a product of prime ideals
• Domain coloring, a technique for visualizing functions of a complex variable
• Domain decomposition methods, solve a boundary value problem by splitting it into smaller problems on subdomains
• Domain of a function, also called the source, the set of input values for which the function is defined
• Domain of discourse, an analytic tool that indicates the relevant set of entities that are being dealt with by quantifiers
• Domain relational calculus, a calculus that was introduced as a declarative database query language for the relational data model
• Domain theory, a branch of mathematics that studies special kinds of partially ordered sets (posets) commonly called domains
• Frequency domain, a term used to describe 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
• Invariance of domain, a theorem in topology about homeomorphic subsets of Euclidean space
• Time domain, a term used to describe the analysis of mathematical functions with respect to time
• Domain, an open and connected set in topology

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

Music

• Domain (album), the debut album by the British metal band Above All
• Domain (band), a German heavy metal band
• Private Domain, an American pop/rock band formed in 1985