The phrase 'ride to altitude' refers to the plane ride itself. A Jumpmaster is an instructional rating and refers to the person who has demonstrated the ability to provide practical instruction for, and direct supervision of, students in the aircraft. This term is used for both static line and AFF jumpmasters. A skydive is the descent of a person to the surface from an aircraft in flight when he or she uses or intends to use a parachute during all or part of that descent. Along these same lines, a skydiver may also be referred to as a jumper .
Stability means having control of body position during freefall.
A student is a skydiver trainee who has not yet been cleared for solo skydiving. In other words, a skydiver in freefall will reach a maximum rate of descent within a few seconds of exiting an aircraft and, all things being equal, that descent speed will remain constant throughout the freefall.