Subdomain meaning

A lower-level component of a domain name. For example, www.mycompany.com and support.mycompany.com are subdomains of mycompany.com, which is known as a "second level domain." See naked domain, zone and root domain.
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A domain or sphere that is part of a larger domain or sphere.
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(computing, Internet) A domain name that has been prefaced with additional parts separated with periods.
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(computing, Internet) An additional part prefaced to a domain name.

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Origin of subdomain

  • sub- +"Ž domain

    From Wiktionary