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
T. H. White b. 1915
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.
Synonyms
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
The malicious apps make network requests to a domain tied to the North Korean regime, letting the app download more malicious scripts that can ultimately give hackers access to a victim's computer.
—Kate Irwin, PCMAG, 12 Nov. 2024
That would have traditionally been the domain of an action project from a Lionsgate, AGC or other brawnier studio.
—Andreas Wiseman, Deadline, 5 Nov. 2024
Anderson agreed to provide capital and domain expertise, joining as an equal cofounder alongside Yadegari and Langmack.
—Josipa Majic Predin, Forbes, 2 Nov. 2024
One source of Trump’s instinctive, inimitable political talent is that, for him, oratory and advertisement are entirely coeval domains.
—Vinson Cunningham, The New Yorker, 1 Nov. 2024
See all Example Sentences for domain 
Examples are automatically compiled from online sources to
show current usage.
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Kate Irwin, PCMAG, 12 Nov. 2024
That would have traditionally been the domain of an action project from a Lionsgate, AGC or other brawnier studio.
—Andreas Wiseman, Deadline, 5 Nov. 2024
Anderson agreed to provide capital and domain expertise, joining as an equal cofounder alongside Yadegari and Langmack.
—Josipa Majic Predin, Forbes, 2 Nov. 2024
One source of Trump’s instinctive, inimitable political talent is that, for him, oratory and advertisement are entirely coeval domains.
—Vinson Cunningham, The New Yorker, 1 Nov. 2024
See all Example Sentences for domain
Dictionary Entries Near domain
Cite this Entry
“Domain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/domain. Accessed 1 Dec. 2024.
Copy CitationKids Definition
domain
noun
do·main
dō-ˈmān 
də-
1
: a territory over which control is exercised
2
: an area of influence, knowledge, or activity
3
: a small region of a magnetic substance that contains atoms all lined up in the same direction and behaving like a single tiny magnet
4
: the highest category in the scientific classification of living things ranking above the kingdom
5
: a main subdivision of the Internet
also
: domain name
Etymology
from early French demeine "land one owns," from Latin dominium "rule, ownership," from dominus "master, owner" — related to condominium, dominate, dominion
Medical Definition
domain
noun
do·main
dō-ˈmān, də-
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—The Journal of the American Medical Association
The Journal of the American Medical Association2
: the highest taxonomic category in biological classification ranking above the kingdom
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