Definitions of domain name on the Web:

• strings of letters and numbers (separated by periods) that are used to name organizations and computers and addresses on the internet; "domain ...
  wordnetweb.princeton.edu/perl/webwn
• A domain name is an identification label to define realms of administrative autonomy, authority, or control in the Internet, based on the Domain ...
  en.wikipedia.org/wiki/Domain_name
• a unique, case-insensitive, name, consisting of a string made up of alphanumeric characters and dashes separated by periods, that the Domain Name System maps to IP numbers and other information; an identifier of a computer or site on the Internet; a domain -- that part of a domain name which ...
  en.wiktionary.org/wiki/domain_name
• The name of a computer on the Internet; the domain name service (DNS) converts domain names to IP addresses.
  www.cs.cornell.edu/wya/DigLib/MS1999/Glossary.html
• An internet web site address.
  www.longtail.co.za/index.php/news/whatis/online-advertising-jargon-for-dummies
• Any domain name registered through Africa Registry as the Registrar of record.
  www.africaregistry.com/africa_registry_policies/terms.html
• The "address" or URL of a particular Web site. This is also how you describe the name that is at the right of the @ sign in an Internet address. For example, netlingo.com is the domain name of this Internet dictionary. ...
  www.netsetgo.com/glossary.php
• a name of a host system in a network. Refers to the name of an Internet site on the World Wide Web.
  www.print-logics.com/printing_terminology.htm
• A name that identifies one or more IP addresses. For example, the domain name microsoft.com represents about a dozen IP addresses. Domain names are used in URLs to identify particular Web pages. For example, in the URL http://www.scvmaxonline.com.sg/subsonly.htm, the domain name is scv. ...
  www.starhub.com/portal/site/Online/menuitem.f2b59af84f3db376da055b608324a5a0/
• A meaningful, easy-to-remember "handle" for addressing computers and information on the Internet. Domain names typically end with a suffix that denotes the type or location of a resource (for instance, ".com" for commercial resources or ".jp" for resources based in Japan).
  www.namesecure.com/pages/web-services-glossary-abcd.jhtml
• The domain name is the official name of computer (host) connected to the Internet.
  www.sapalovelez.com/definition_and_commonterms.htm
• The text name corresponding to the IP address of a computer on the Internet. For example, www.webtrends.com is a domain name.
  https://sharepoint.agriculture.purdue.edu/agit/webtrends_glossary.aspx
• A sign post on the Internet, it is a unique name that identifies an Internet site.
  www.indie-music.com/modules.php
• A quoted string which will be used as a DNS name, for example "my.test.domain" .
  nf.apac.edu.au/facilities/sc/compaq_mirror/HTML/SUPPDOCS/BIND_GDE/DOCU0005.HTM
• A domain name locates an organization or other entity on the Internet. For example, the domain name www.csusb.edu
  www.geocities.com/w9227/Edweb/Golssary.htm