domain

noun

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do·main | \ dō-ˈmān

, 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.

Synonyms More Example Sentences Phrases Containing domain Learn More About domain

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.

Recent Examples on the Web Grattagliano has previously been accused of registering domain names associated with his competitors. — Louise Matsakis, Wired, 28 Feb. 2022 That was not the case for registration of domain names. — Jess Collen, Forbes, 21 Jan. 2022 But this abundance is coupled with welfare states that encompass almost every domain and aspect of human existence, attenuating personal freedom and virtue. — Richard M. Reinsch Ii, National Review, 17 Feb. 2022 Mobile internet speed is a central advancement of 5G, which enables a new domain of breakthrough applications with potent economic and national-security implications. — Graham Allison And Eric Schmidt, WSJ, 16 Feb. 2022 Innovation is considered the domain of mathematicians and scientists, and engineering often receives all the focus. — Alex Salkever, Fortune, 15 Feb. 2022 The world’s biggest fast-food chain’s embrace of hackery — usually the domain of consumers, not corporations — feels significant. — Washington Post, 8 Feb. 2022 Simply put, for Russia, war never stops and cyberspace is a key domain of its persistent conflict with Ukraine and the West. — Maggie Smith, The Conversation, 7 Feb. 2022 The Rose Bowl is historic, but it’s the domain of a UCLA team that nobody watches. — Bill Plaschke, Los Angeles Times, 6 Feb. 2022 See More

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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Dictionary Entries Near domain

Domagk

domain

domainal

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Last Updated

12 Mar 2022

Cite this Entry

“Domain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/domain. Accessed 18 Mar. 2022.

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More Definitions for domain

domain

noun

do·main | \ dō-ˈmān

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

3 : domain name

domain

noun

do·main | \ dō-ˈmān, də-

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 class — Journal of the American Medical Association

2 : the highest taxonomic category in biological classification ranking above the kingdom