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## domain

domain
1. In general, a sphere of control, influence, or concern.

3. of a network. Part of a larger network. A domain is usually defined in terms of some property, such as that part of the network that is under the jurisdiction of a single management body (a management domain), or where all the network addresses are assigned by a single controlling authority (a naming domain). See also domain name server.

4. In the relational model, a set of possible values from which the actual values in any column of a table (relation) must be drawn.

5. In denotational semantics, a structured set of mathematical entities in which meanings for programming constructs can be found. The idea first arose in the work of Dana Scott, who with Christopher Strachey pioneered this mathematical approach to programming language semantics. The approach focuses on fixed-point theorems. Scott required domains to be complete lattices, but this has been simplified through a great deal of mathematical research. There are now many kinds of domains, but a commonly used one is the Scott–Ershov domain, which is a consistently complete algebraic cpo (complete partial ordering). For such mathematical structures a fine theory of constructing new domains from old and solving fixed-point equations has been developed. The domain theory has many applications in finding semantics for programming and specification languages, and approximating data types. Mathematically the theory is closely linked to topology and algebra.

6. See protection domain.

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"domain." A Dictionary of Computing. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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## domain

do·main / dōˈmān/ • n. an area of territory owned or controlled by a ruler or government: the southwestern French domains of the Plantagenets. ∎  an estate or territory held in legal possession by a person or persons. ∎  a specified sphere of activity or knowledge: the expanding domain of psychology | fig. visual communication is the domain of the graphic designer. ∎  Physics a discrete region of magnetism in ferromagnetic material. ∎  Comput. a distinct subset of the Internet with addresses sharing a common suffix, such as the part in a particular country or used by a particular group of users. ∎  Math. the set of possible values of the independent variable or variables of a function. DERIVATIVES: do·ma·ni·al / -nēəl/ adj.

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"domain." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"domain." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/domain-0

"domain." The Oxford Pocket Dictionary of Current English. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/domain-0

## domain

domain
1. (in biochemistry) A functional unit of the tertiary structure of a protein. It consists of chains of amino acids folded into alpha helices and beta sheets to form a globular structure. Different domains are linked together by relatively straight sections of polypeptide chain to form the protein molecule. Domains allow a degree of movement in the protein structure. See also finger domain.

2. (in taxonomy) In some classification systems, the highest taxonomic category, consisting of one or more kingdoms. Some authors divide living organisms into three domains: Archaea (archaebacteria), Bacteria (eubacteria; see bacteria), and Eukarya (eukaryotic organisms).

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"domain." A Dictionary of Biology. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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"domain." A Dictionary of Biology. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/domain-1

# DOMAIN

The complete and absolute ownership of land. Also the real estate so owned. The inherent sovereign power claimed by the legislature of a state, of controlling private property for public uses, is termed the right of eminent domain.

National domain is sometimes applied to the aggregate of the property owned directly by a nation. Public domain embraces all lands, the title to which is in the United States, including land occupied for the purposes of federal buildings, arsenals, dock-yards, and so on, and land of an agricultural or mineral character not yet granted to private owners.

Sphere of influence. Range of control or rule; realm.

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"Domain." West's Encyclopedia of American Law. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"Domain." West's Encyclopedia of American Law. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/law/encyclopedias-almanacs-transcripts-and-maps/domain

"Domain." West's Encyclopedia of American Law. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/law/encyclopedias-almanacs-transcripts-and-maps/domain

## domain

domain In mathematics, a set of values that can be assigned to the independent variable in a function or relation; the set of values of the dependent variable is called the range. For example, let the function be y = x2, with x restricted to 0, 1, 2, 3 and −3. Then y takes the values 0, 1, 4, 9 and 9 respectively. The domain is {0, 1, 2, 3, −3} and the range is {0, 1, 4, 9}.

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"domain." World Encyclopedia. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"domain." World Encyclopedia. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/domain

"domain." World Encyclopedia. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/domain

## domain

domain In taxonomy, some experts recognize the domain as a higher category than kingdom. In this scheme, the two subkingdoms of Prokaryote (Archaebacteria and Eubacteria) constitute two domains, called Archaea and Bacteria, while all other living organisms are in a third domain, eukaryotes. See also phylogenetics; plant classification

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## domain

domain estate, lands, dominions XVII; sphere of thought or action XVIII; lordship XIX. — F. domaine, alt-, by assoc. with L. dominium (see DOMINION), of OF. demaine, demeine DEMESNE.

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"domain." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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## domain

domain The primary division of living systems. There are three domains: Archaea, Eubacteria, and Eucaryota.

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"domain." A Dictionary of Earth Sciences. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"domain." A Dictionary of Earth Sciences. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/domain

"domain." A Dictionary of Earth Sciences. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/domain

## domain

domain The primary division of living systems. There are three domains: Archaea, Eubacteria and Eucaryota.

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"domain." A Dictionary of Ecology. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"domain." A Dictionary of Ecology. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/domain-0

"domain." A Dictionary of Ecology. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/domain-0

## domain

domain, in physics: see magnetism.

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"domain." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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## domain

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