Definitions of domain name service on the Web:

• The Domain Name System (DNS) is a hierarchical naming system for computers, services, or any resource participating in the Internet. ...
  en.wikipedia.org/wiki/Domain_Name_Service
• A service that translates domain names into IP addresses.
  www.hp.com/wwsolutions/misc/hpsim-helpfiles/mxhelp/mxportal/en/sys-glossary.html
• Domain Name Service (DNS), sometimes referred to as a name server, is a computer that handles name queries for all hosts within a particular ...
  www.globalweb.co.uk/glossary.html
• (DNS) A static, hierarchical name service used with TCP/IP hosts, & is housed on a number of servers on the Internet. ...
  www.iec.net/Browse05/GLSD.html
• The Internet system whereby textual addresses (such as www.parliament.vic.gov.au) are converted into Internet provider numbers (203.16.24.1). ...
  www.parliament.vic.gov.au/SARC/E-Democracy/Final_Report/Glossary.htm
• A distributed pool of information (called the name space) that keeps track of assigned domain names and their corresponding IP addresses and the ...
  www.build-your-own-cheap-computer.com/computer-terms.html
• A sort of Internet phone book. While we humans recognize a web site by domain name, a network recognizes it by IP address. ...
  www.rose.net/
• The resolution of character based Uniform Resource Locators into the dotted decimal notation used to perform Internet switching and routing which may refer to the servers providing this facility.
  www.pro-net.co.uk/content/About%20us/Terms%20and%20conditions/Definitions
• The system used on the Internet for mapping domain names to the actual numerical addresses of machines on the Internet, or IP addresses.
  www.computerhelps.net/terminology.html
• This is the method by which a URL (such as www.Nautical Wireless.net, for example) is converted to the IP address for the Web page that a person is trying to view. The computer actually uses the IP address, not the URL. ...
  www.nauticalwireless.com/html/glossary.html
• A protocol by which computer host names may be resolved to the matching IP address/es. DNS is implemented by the Berkeley Internet Name Daemon. ...
  www.chmhome.com/Samba-HOWTO-Collection/glossary.html