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Definition of domain

domain

/doʊˈmeɪn/
do · main

Plural:domains
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domain Lexical Profile

domain Game Scores & Validity

• noun

1

A specified sphere of activity, knowledge, or influence.

Example

"Artificial intelligence has rapidly moved from the domain of academic research into everyday consumer technology."


2

A distinct subset of the internet with addresses sharing a common suffix or under the control of a particular organization or individual.

Example

"We registered a new domain for the company's upcoming e-commerce website."


3

An area of territory owned or controlled by a particular ruler, government, or proprietor.

Example

"The ancient king expanded his domain across the neighboring river valleys."


4

The set of all possible input values for which a mathematical function is defined.

Example

"Because division by zero is undefined, zero must be excluded from the domain of this rational function."


5

The highest taxonomic rank of organisms in biology, above kingdom, comprising Archaea, Bacteria, and Eukarya.

Example

"In modern biological classification, all cellular life is divided into three primary domains."

Synonyms
View all synonyms for domain

• Rhymes for domain

Word Origin & Etymology

Borrowed from Middle French 'domaine', a modification (influenced by Latin 'dominus', meaning 'lord') of Old French 'demaine', from Latin 'dominium' ('property, ownership').

Cite this Entry


Wordmom. (2026). Definition of Domain. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/domain
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