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The Collaborative International Dictionary
world-wide web

world-wide web \world"-wide` web"\, 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.

Syn: Web, the web, WWW.

Douglas Harper's Etymology Dictionary
World-Wide Web

also World Wide Web, 1990. See worldwide + web (n.).