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virtual -- A commonly used adjective that means having all of the properties of x while not necessarily being x. For example, "virtual Friday" in a workplace is the last day of work before a break, that is to say it is like Friday but may or may not actually be Friday. A "virtual reality" is an artificial environment that appears to be its own reality. On a mainframe, a "virtual machine" gives the user all of the properties and "feel" of a separate personal computer.
 

Virtual Reality Markup Language -- (abbreviation: VRML)
A scripting language used to define three-dimensional "worlds".
 

virus -- An insidious piece of computer code written to damage systems. Viruses can be hidden in executable program files posted online.
 

VRML -- See Virtual Reality Markup Language.