virtual >> ˈvəːtʃʊ(ə)l
Definition: [adjective] almost or nearly as described, but not completely or according to strict definition.
Example: the virtual absence of border controls
Definition: [adjective] not physically existing as such but made by software to appear to do so.
Example: virtual images
Definition: [adjective] relating to the points at which rays would meet if produced backwards.
Definition: [adjective] relating to or denoting infinitesimal displacements of a point in a system.
Definition: [adjective] denoting particles or interactions with extremely short lifetimes and (owing to the uncertainty principle) indefinitely great energies, postulated as intermediates in some processes.