Plain English Meaning
Flying straight, level, and steady, with no turning, climbing acceleration, or pulling up — so the airplane and everyone in it feel their normal weight, nothing more.
Full Definition
A condition of flight in which the aircraft maintains a constant airspeed and a constant flight path, with no change in direction or speed, so that the only load acting on the airframe and occupants is normal gravity — a load factor of 1G.
Context Anchor
Seen in stall discussions when comparing the normal stall speed to in , pull-ups, or other higher-load situations.