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

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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 Livestreaming, mostly the domain of avid gamers in the U.S. and Europe, is popular as general entertainment in China. Claire Che,, "China’s Quarantined Club Kids and Gym Rats Turn to Livestreaming," 9 May 2020 To her surprise, the domain for The Hangry Woman was available, as were all of the social handles. Corey J. Maloney,, "After She Was Diagnosed With Type 2 Diabetes, This Woman's Doctor Blamed Her for Causing It," 30 Apr. 2020 Indeed, the digital domain is hardly emissions-free. Irina Ivanova, CBS News, "Coronavirus is pushing more work online. Is that good for the planet?," 22 Apr. 2020 Wartime mobilization is surely the domain of the federal government, right? Karl Zinsmeister, WSJ, "Wars Aren’t Won by Government Alone," 1 Apr. 2020 Dominion’s domain The current champion of making deals around manure recycling is Dominion Energy Inc. of Richmond, Va., a utility that sells electricity or natural gas to 7.5 million customers in 18 states. John Fialka, Scientific American, "Gas Companies Want to Recycle Your Manure," 6 Mar. 2020 Psalm West's domain is adjacent to the stage, featuring the youngest's various toys lounging next to North's L.O.L. Surprise! Heran Mamo, Billboard, "You Have to See Kim Kardashian's Tour of Her Kids' Epic Playroom," 13 Feb. 2020 In SARS-CoV-2 the spike protein on the viral particle’s surface has a receptor-binding domain (RBD) that is adept at sticking to a particular molecule on the surface of the human cells the virus infects. The Economist, "The origin of covid-19 The pieces of the puzzle of covid-19’s origin are coming to light," 2 May 2020 Comets in our solar system follow looping orbits that push them right to the edge of the sun’s domain, where the slightest gravitational nudge could knock them free. Charlie Wood, Popular Science, "A new ’Oumuamua theory could mean many more interstellar visitors are headed our way," 14 Apr. 2020

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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Time Traveler for domain

Time Traveler

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

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Statistics for domain

Last Updated

18 May 2020

Cite this Entry

“Domain.” Dictionary, Merriam-Webster, Accessed 26 May. 2020.

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More Definitions for domain


How to pronounce domain (audio)

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)


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


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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