plural domains
1
: the land that a ruler or a government controls : territory
The forest is part of the king's domain.
the British/Ottoman imperial domain
2
: an area of knowledge or activity
My sister is the math expert in the family, but literature is my domain.
Childcare is no longer solely a female domain.
—often + ofFederal crimes are outside the domain of city police.
3
computers
a
: 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)
Note: An abbreviation of an Internet site's domain (such as .gov, .org, and .com) is included in its address: www.Merriam-Webster.com.
b
Cite this Entry
“Domain.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/domain. Accessed 20 Jun. 2026.
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