subdomain name



  • noun an organisational name consisting of two or three letters, e.g. ac or .com, that precedes the two-letter country domain name in an Internet address, as in ‘’, the address for Australian commercial sites.

Information & Library Science

  • noun a second level of Internet domain names created by the administrator of the domain
  • noun a subdivision of the two-letter country domain names into two- or three-letter organisational subdomains, e.g. ‘’ for United Kingdom academic sites and ‘’ for Australian commercial sites.