Autorotation Regulation
Autorotation means a rotorcraft or powered-lift flight condition in which the lifting rotor is driven entirely by action of the air when the rotorcraft or powered-lift is in motion.
Also defined in 1 more source
The condition of flight during which the main rotor is driven only by aerodynamic forces with no power from the engine.
Guidance: Helicopter Flying Handbook, p. G-1
Taught in AF-N Quick reference.