- 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 ‘.com.au’, 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. ‘ac.uk’ for United Kingdom academic sites and ‘com.au’ for Australian commercial sites.