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

But at EssenceFest, Disney was in our domain among economic forums, professional development hubs, wellness talks, black artisan shops, film screenings, and performances from Lil’ Kim and Big Freedia. Jeneé Osterheldt, BostonGlobe.com, "Essence Festival is a black woman’s world," 10 July 2019 The baby was born during the death throes of Islamic State’s caliphate—when all that remained of its once vast domain was a cluster of tents in a remote corner of Syria. Isabel Coles, WSJ, "Hard-Core Islamic State Members Carry Ideology From Crushed Caliphate," 18 Mar. 2019 In December 2016, Ivanka and her husband, Jared Kushner, set up a new email account at the domain ijkfamily.com. Timothy B. Lee, Ars Technica, "Ivanka Trump used personal email for official White House business," 20 Nov. 2018 For example, on or about July 27, 2016, the conspirators attempted after hours to spearphish for the first time email accounts at a domain hosted by a third‑party provider and used by Clinton’s personal office. Matt Ford, The New Republic, "Truth Without Consequences," 13 July 2018 In some cases, those affiliations required authorization, for example having an email address at a domain that corresponds with a university. Ian Bogost, The Atlantic, "My Cow Game Extracted Your Facebook Data," 22 Mar. 2018 This included the Gutenberg Project's public-domain books and the Internet Archive's legendary collection of Grateful Dead recordings. The Economist, "Regulating Big Tech makes them stronger, so they need competition instead," 6 June 2019 Right now, Google says its is limiting the Duplex technology to very specific domains, but Havens sees potential for expansion of those limits. Lauren Goode, WIRED, "How Google's Eerie Robot Phone Calls Hint at AI's Future," 8 May 2018 What was once the domain of a handful of big players like AerCap and GE Capital Aviation Services, levering insider knowledge of planes and airlines, is now a patchwork of 20 or so smaller lessors trading similar aircraft at ever lower margins. Jon Sindreu, WSJ, "Aircraft Investors Should Be More Grounded," 25 Jan. 2019

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

14 Jul 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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