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

Ward recounts a specific incident during the transition when Ivanka had earmarked an office for herself in the East Wing, the traditional domain of the first lady. Emma Dibdin, Town & Country, "Does Ivanka Trump Really Want to Be President Someday?," 19 Mar. 2019 This fourth industrial revolution driven by robots is shaping urban spaces and urban life in response to opportunities and challenges in economic, social, political and healthcare domains. Mateja Kovacic, Smithsonian, "What Will the Automated City of the Future Look Like?," 10 Apr. 2018 Sarah also gets a significant amount of say in what goes on in Anne’s domain, making decisions like whether the nation should go to war and how the palace is run. Cady Drell, Marie Claire, "What Is The Favourite Movie About? It's a Rom-Com of a Sort," 23 Feb. 2019 No, in American poetry, politics was the domain of the few and the fearless, poets like Adrienne Rich or Denise Levertov, whose outsize conscience justified such risky behavior. Constance Grady, Vox, "Victorian literature was full of lady detectives," 15 Dec. 2018 These include transfer learning, where knowledge in one domain is applied to another, and unsupervised learning, where systems learn without human direction. James Vincent, The Verge, "This is when AI’s top researchers think artificial general intelligence will be achieved," 27 Nov. 2018 Bacteria form one domain; their close relatives, archaea, form another. Avery Thompson, Popular Mechanics, "Scientists Discover a Whole New Kingdom of Life," 19 Nov. 2018 Intrusion Truth linked internet domains and email addresses associated with websites used by APT 10 to two other Chinese companies, Tianjin Huaying Haitai Science and Technology Development Co. and Laoying Baichaun Instruments Equipment Co. Robert Mcmillan, WSJ, "Cyberespionage Experts Want to Know Who’s Exposing China’s Hacking Army," 2 Oct. 2018 In fact, there was a steep drop-off of malicious domains hosted in Russia and China compared to the first-quarter, as China fell from the No. 2 spot, Palo Alto said. Brooke Crothers, Fox News, "US is the world's hotspot for malicious websites," 6 Sep. 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

19 May 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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