being such in power, force, or effect, though not actually or expressly such: a virtual dependence on charity.
Optics. noting an image formed by the apparent convergence of rays geometrically, but not actually, prolonged, as the image formed by a mirror (opposed to real). noting a focus of a system forming virtual images.
temporarily simulated or extended by computer software: a virtual disk in RAM; virtual memory on a hard disk.
having the essence or effect but not the appearance or form of: a virtual revolution
(physics) being, relating to, or involving a virtual image: a virtual focus