1) Descent 2) Descent with a parachute 3) Jump 4) Jumping from a plane 1) Skydiving 
Parachuting, or skydiving, is the action sport of exiting an aircraft and returning to Earth with the aid of gravity, then slowing down during the last part of the descent by using a parachute. It may or may not involve a certain amount of free-fall, a time during which the parachute has not been deployed and the body gradually accelerates to term...
noun descent with a parachute; `he had done a lot of parachuting in the army`