domain

US /doʊˈmeɪn/
UK /doʊˈmeɪn/
"domain" picture
1.

an area of territory owned or controlled by a ruler or government

:
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The king's domain extended across several kingdoms.
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This forest is part of the royal domain.
:
territoryrealmkingdomdominionprovince
2.

a specific sphere of activity or knowledge

:
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Physics is a complex domain of study.
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That's outside my domain of expertise.
:
fieldareasphererealmprovince
3.

a group of computers and devices on a network that are administered as a unit with common rules and procedures

:
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The company's network domain is protected by strong firewalls.
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Each user has an account within the corporate domain.
:
networksystemzone
4.

a unique name that identifies a website on the internet

:
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You need to register a domain name for your new website.
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Our website's domain is example.com.
:
website addressURLweb address
:
domain name