Dynamic stability
The property of an aircraft that causes it, when disturbed from straight-and level flight, to develop forces or moments that restore the original condition of straight and level.
Aviation Maintenance Technician Handbook — General, p. G-4; Pilot's Handbook of Aeronautical Knowledge, p. G-11
Also defined in 1 more source
The stability that causes an aircraft to return to a condition of straight and level flight after it has been disturbed from this condition. When an aircraft is disturbed from the straight and level flight, its static stability starts it back in the correct direction; but it overshoots, and the corrective forces are applied in the opposite direction. The aircraft oscillates back and forth on both sides of the correct condition, with each oscillation smaller than the one before it. Dynamic stability is the decreasing of these restorative oscillations.
Aviation Maintenance Technician Handbook — Airframe, p. G-13
Taught in GEN-J Quick reference.