Plain English Meaning

The faster the wings have to work to support more than the airplane's normal weight — like in a steep turn — the higher the speed at which the airplane will stop flying and stall. Pull harder on the controls and the airplane will stall at a higher speed than it would in level flight.

Full Definition

The aerodynamic principle that the airspeed at which an aircraft will stall rises whenever load factor exceeds 1G, such as during turns, pull-ups, or recovery from dives. The increase is proportional to the square root of the load factor: at 2Gs, stalling speed is approximately 1.4 times the wings-level (1G) ; at 4Gs, it doubles.