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/browse/virtual

In object-oriented programming, a virtual function or virtual method is one whose behavior can be overridden within an inheriting class by a function with the same signature.
http://en.wikipedia.org/wiki/Virtual_functions

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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/virtualpc/default.mspx