Noun

(en noun)

A geographic area owned or controlled by a single person or organization.

The king ruled his domain harshly.

A field or sphere of activity, influence or expertise.

Dealing with complaints isn't really my domain : get in touch with customer services.

His domain is English history.

A group of related items, topics, or subjects.

* {{quote-magazine, date=2012-01

, author=Michael Riordan , title=Tackling Infinity , volume=100, issue=1, page=86 , magazine= citation , passage=Some of the most beautiful and thus appealing physical theories, including quantum electrodynamics and quantum gravity, have been dogged for decades by infinities that erupt when theorists try to prod their calculations into new domains . Getting rid of these nagging infinities has probably occupied far more effort than was spent in originating the theories.}}

(mathematics) The set of all possible mathematical entities (points) where a given function is defined.

(mathematics) A of nonzero elements is zero.

(mathematics, topology, analysis) An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers.

(computing, Internet) Any DNS]] domain name, particularly one which has been delegated and has become representative of the delegated domain name and its [[subdomain, subdomains

* 2000 , BIND 9 Administrator Reference Manual (9.3.2) , Internet Software Consortium [http://www.bind9.net/manual/bind/9.3.2/Bv9ARM.ch01.html]

Every name in the DNS tree is a domain , even if it is terminal, that is, has no subdomains.

(computing, Internet) A collection of DNS]] or DNS-like domain names consisting of a delegated domain name and all its [[subdomain, subdomains

(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

(computing) The collection of computers identified by a domain' s domain names

(physics) A small region of a magnetic material with a consistent magnetization direction; such a region used as a data storage element in a bubble memory

(data processing) a form of technical metadata that represent the type of a data item, its characteristics, name, and usage

* {{quote-web

, year = unknown , author = IBM , title = IBM Terminology - terms D , site = 'IBM Software , Globalization , Terminology' , url = http://www-01.ibm.com/software/globalization/terminology/d.html , accessdate = 2013-12-29 }}

A characteristic of a field. A data domain specifies a data type and applies the minimum and maximum values allowed and other constraints.

(biology, taxonomy) The highest rank in the classification of organisms, above kingdom; in the three-domain system, one of the taxa Bacteria'', ''Archaea'', or ''Eukaryota .

(biochemistry) A folded section of a protein molecule that has a discrete function

Noun

(en noun)

A large building that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king.

(chess) An instance of castling.

(chess, informal) A rook; a chess piece shaped like a castle tower.

(obsolete) A close helmet.

* 1786 , Francis Grose, A Treatise on Ancient Armour and Weapons , p. 12,

The castle was perhaps a figurative name for a close headpiece deduced from its enclosing and defending the head, as a castle did the whole body; or a corruption from the Old French word casquetel , a small or light helmet.

(dated) Any strong, imposing, and stately mansion.

(dated) A small tower, as on a ship, or an elephant's back.