Should it be any of these descriptions below :

Autonomy: Ability of a UAS to sense and act on a situation. Includes navigation, communications, sensing, deciding and acting 

Level of Autonomy: A measure of the amount of human interruption

Autonomous: The human assigns a mission and the UAS accomplishes the mission without any human interruption 

Semi-autonomous: The human plans and the mission and the UAS conducts the mission with various levels of autonomy and various levels of human interruption