Definition has to be "Flying beyond the Stall" I think there is more to it than that, but it is short and catchy, and really covers the main aim.

In a harrier, the wing is creating lift, but not in the conventional sense. The wing is stalled, which means the airflow over the top of the wing has broken away, and so is not creating a low preasure area (remember that for an unstalled wing in normal flight, aprox 2/3 of the lift is created by the low preasure over the wing, 1/3 by high preasure under the wing). However the angle of attack will still be creating a high presure area under the wing, which will be higher than normal, and so generate lift.

The proof is in the pudding - in a harrier I use a lower throttle setting than in the hover/torque roll, and given that the thrust is at an angle to the ground, to produce forward motion, not all of the thrust is pushing against gravity and creating lift.