virtual

In effect or essence, rather than in fact or reality; also, imitated, simulated.

For practical purposes, though not technically; almost complete, very near.

Operating using a computer and/or online rather than physically present.

Simulated in a computer and/or online.

Of a class member: capable of being overridden with a different implementation in a subclass.

Pertaining to a theoretical infinitesimal velocity in a mechanical system that does not violate the system's constraints; also, of other physical quantities: resulting from such a velocity.

Pertaining to a theoretical quality of something which would produce an observable effect if counteracting factors such as friction are disregarded; specifically, of a head of water: producing a certain pressure if friction, etc., is disregarded.

Chiefly in virtual focus: of a focus or point: from which light or other radiation apparently emanates; also, of an image: produced by light that appears to diverge from a point beyond the reflecting or refracting surface.

Pertaining to particles in temporary existence due to the Heisenberg uncertainty principle.

Of a quantum state: having an intermediate, short-lived, and unobservable nature.