Airfoil (aerofoil): a wing, kite, or sail used to generate lift or propulsion.
Airtime: the amount of time spent in the air while jumping.
AOA, Angle of Attack: also known as the angle of incidence (AOI) is the angle with which the kite flies in relation to the wind. Increasing AOA generally gives more lift.
AOI, Angle of Incidence: angle which the kite takes compared to the wind direction