Definitions of virtual hosting on the Web:

• Virtual hosting is a method that servers such as web servers use to host more than one domain name on the same computer, sometimes on the same IP ...
  en.wikipedia.org/wiki/Virtual_hosting
• A way of hosting multiple Web sites, for a single, or multiple, customers, on a single piece of server hardware. ...
  www.bbn.com/utility/glossary/V
• to serve many web sites using one IP addressIP address An IP address is a unique number that devices use in order to identify and communicate with each other on a computer netwo... .
  www.absoluteastronomy.com/topics/Web_server
• Virtual hosting is a powerful feature available with all server options at vitalnet.com. Virtual hosting allows you to host additional domains on your server account for a low monthly fee, rather than purchase a separate account for each. ...
  www.vitalnet.net/h/support_glossary.html
• The most basic type of web hosting. A web server is shared for numerous web sites. Virtual Private Server (VPS) - Almost the same as a managed server. The main difference is that several Virtual Private Servers are on one server. ...
  www.dirt-cheap-web-hosts.com/glossary-hosting-terms.html