World Wide Web

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The complete set of documents residing on all Internet servers that use the HTTP protocol, accessible to users via a simple point-and-click system.

Wiktionary

1. n. Collectively, all of the web pages on the Internet which hyperlink to each other and to other kinds of documents and media.
2. n. computing Internet resources that are retrieved by Hypertext Transfer Protocol (HTTP).

GNU Webster's 1913

1. n. The collective total of all computer installations that are connected to the internet and provide access to other computers connected to the internet, using hypertext transfer protocol, to computer files called web pages, which may have text, graphics, audio or animated video data, as well as pages which may provide data or information in all those forms.

WordNet 3.0

1. n. computer network consisting of a collection of internet sites that offer text and graphics and sound and animation resources through the hypertext transfer protocol