Plain English Meaning
A VOR-style point that lives inside the airplane's navigation computer, not a real VOR transmitting from the ground. The computer uses it as a reference to draw the path, but the airplane is not actually receiving a signal from it.
Full Definition
A VOR navigation aid that exists only as a coded reference point inside the FMS or RNAV navigation database, used to define a procedure leg, fix, or course alignment. It is not transmitted by an actual ground-based VOR station tuned and tracked by the aircraft's radio receivers; it is a stored coordinate and bearing reference the uses internally to fly the procedure.