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virtual: [via the technical term `virtual memory', prob. from
   the term `virtual image' in optics] adj. 1. Common alternative
   to logical; often used to refer to the artificial objects
   (like addressable virtual memory larger than physical memory)
   created by a computer system to help the system control access to
   shared resources.  2. Simulated; performing the functions of
   something that isn't really there.  An imaginative child's doll may
   be a virtual playmate.  Oppose real.