a second generation in the development of the World Wide Web, conceived as a combination of concepts, trends, and technologies that focus on user collaboration, sharing of user-generated content, and social networking.
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British Dictionary definitions for Web 2.0
the internet viewed as a medium in which interactive experience, in the form of blogs, wikis, forums, etc, plays a more important role than simply accessing information
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012