The ideal falling motion of something subject only to a gravitational field.
2.
A sudden sharp decrease in some quantity. Synonyms:dip, drop, fall."There was a drop in pressure in the pulmonary artery" , "A dip in prices" , "When that became known the price of their stock went into free fall"
... he was in free fall. The ship had cleared the pull of earth's gravity and was out in space where everything was weightless. Reaching toward the control panel, he flipped the switch for the synthetic-gravity generator and, ... — Stand by for Mars! • Carey Rockwell
... the ship entered the atmosphere at operational velocity and not less than free fall," the ... — A Fine Fix • R. C. Noll