The term virtual is a concept applied in many fields with somewhat differing connotations, and also, differing denotations. Colloquially, 'virtual' has a similar meaning to ' quasi ...
http://en.wikipedia.org/wiki/Virtual

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http://dictionary.reference.com/search?q=virtual

Software virtualization solution that allows to run multiple PC-based operating systems simultaneously on one workstation. News, product information.
http://www.microsoft.com/windows/products/winfamily/virtualp ...

A digital library containing Java applets and activities for K-12 mathematics
http://nlvm.usu.edu/en/nav/vlibrary.html

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http://dictionary.reference.com/search?q=virtual&db=luna