domain

noun
do·​main | \ dō-ˈmān How to pronounce domain (audio) , də-\

Definition of domain

1 law

a : complete and absolute (see absolute sense 3) ownership of land our highways and roads have been in the domain of state and local governments— T. H. White b. 1915 — compare eminent domain
b : land so owned
2 : a territory over which dominion (see dominion sense 2) is exercised The forest is part of the king's domain.
3 : a region distinctively marked by some physical feature a domain of rushing streams, tall trees, and lakes
4 : a sphere (see sphere sense 4b) of knowledge, influence, or activity the domain of biblical scholarship outside the domain of city police
5 mathematics : the set of elements (see element sense 2b(3)) to which a mathematical or logical variable is limited specifically : the set on which a function (see function entry 1 sense 5a) is defined
6 physics : any of the small randomly oriented regions of uniform magnetization in a ferromagnetic substance
7 mathematics : integral domain
8 biology : the highest taxonomic category in biological classification ranking above the kingdom (see kingdom sense 4b)
9 biochemistry : any of the three-dimensional subunits of a protein that are formed by the folding of its linear peptide chain and that together make up its tertiary (see tertiary entry 1 sense 3c) structure
10 computers : a subdivision of the Internet consisting of computers or sites usually with a common purpose (such as providing commercial information) and denoted in Internet addresses by a unique abbreviation (such as com for commercial sites or gov for government sites) The domain ca is used for sites located in Canada. also : domain name Our domain is Merriam-Webster.com.

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Examples of domain in a Sentence

The forest is part of the king's domain. My sister is the math expert in the family, but literature is my domain. Childcare is no longer solely a female domain.
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Recent Examples on the Web

As in other digital domains, such as artificial intelligence, China is sparing no effort to establish itself as a world leader, so the government badly wants more people like Mr Zhong to return. The Economist, "Turtles and seagullsWhat happens when Chinese students abroad return home," 17 May 2018 Military readiness to conduct operations — from security cooperation to countering terrorism and weapons of mass destruction, deterring adversaries, and being prepared to defend the homeland from attack in all domains — is paramount. Jim Banks, National Review, "We Must Improve Our Military Readiness," 9 Feb. 2018 Her approach has been applied to homes—her primary domain—but also to shopping, and boyfriends. Lauren Sanchez, Vogue, "How I KonMari’d My Inbox (and My Desktop, and My Phone)," 28 Jan. 2019 As evidenced by the history of the Banana Wars, the United States has long considered Latin America a subordinate part of its imperial domain. Lucy Diavolo, Teen Vogue, "Donald Trump Is Threatening to Declare a National Emergency to Get Border Wall Funding. Here's Why He Shouldn’t.," 11 Jan. 2019 Everything in her domain had to be absolutely correct. Chloe Foussianes, Town & Country, "The Marvelous Mrs. Maisel," 16 Dec. 2018 Neither Weinberg nor Google confirmed how much, if anything, was paid for the domain. Jon Porter, The Verge, "Google relents and transfers Duck.com to DuckDuckGo," 12 Dec. 2018 Whereas in the Grand Central model, the TSO will have to single-handedly keep track of all the blooming and buzzing DERs beneath it — which, let’s be serious, will eventually overwhelm it — in the LDO model, each layer is its own, tractable domain. David Roberts, Vox, "Clean energy technologies threaten to overwhelm the grid. Here’s how it can adapt.," 30 Nov. 2018 Each of those magicians took that vision and put it into their own domain. Eric Johnson, Recode, "General Magic tried to invent a smartphone in the 1990s. This is why it failed.," 30 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'domain.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of domain

15th century, in the meaning defined at sense 1a

History and Etymology for domain

alteration of Middle English demayne, from Anglo-French demeine, from Latin dominium, from dominus — see dominate

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Learn More about domain

Dictionary Entries near domain

Dom

dom

Domagk

domain

domainal

domaine

domain name

Statistics for domain

Last Updated

10 Mar 2019

Look-up Popularity

Time Traveler for domain

The first known use of domain was in the 15th century

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More Definitions for domain

domain

noun

English Language Learners Definition of domain

: the land that a ruler or a government controls
: an area of knowledge or activity
: a section of the Internet that is made up of computers or sites that are related in some way (such as by use or source)

domain

noun
do·​main | \ dō-ˈmān How to pronounce domain (audio) \

Kids Definition of domain

1 : land under the control of a ruler or a government
2 : a field of knowledge or activity the domain of science

domain

noun
do·​main | \ dō-ˈmān, də- How to pronounce domain (audio) \

Medical Definition of domain

1 : any of the three-dimensional subunits of a protein that together make up its tertiary structure, that are formed by folding its linear peptide chain, and that are variously considered to be the basic units of protein structure, function, and evolution immunoglobulin light chains have two domains and heavy chains have four or five domains, depending on classJournal of the American Medical Association
2 : the highest taxonomic category in biological classification ranking above the kingdom

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More from Merriam-Webster on domain

Rhyming Dictionary: Words that rhyme with domain

Thesaurus: All synonyms and antonyms for domain

Spanish Central: Translation of domain

Nglish: Translation of domain for Spanish Speakers

Britannica English: Translation of domain for Arabic Speakers

Britannica.com: Encyclopedia article about domain

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