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