Free fall is described in Newtonian physics as the motion of an item where gravity is the sole force acting on it.
A skydiver, by this definition, is never truly free falling, even before they release their parachute.
Although gravity pulls a skydiver towards the ground, they are also influenced by air resistance, a force that opposes their downward path.
As a result, it does not conform to the exact definition of a free fall.
Final answer:
Hence, the motion of an item where gravity is the sole force acting on it is known as free fall.