(1):

(a.) Caused or imparted by impulse or projection; impelled forward; as, projectile motion.

(2):

(a.) Projecting or impelling forward; as, a projectile force.

(3):

(n.) A body projected, or impelled forward, by force; especially, a missile adapted to be shot from a firearm.

(4):

(n.) A part of mechanics which treats of the motion, range, time of flight, etc., of bodies thrown or driven through the air by an impelling force.