Definition of waiver. 1  1 : the act of intentionally relinquishing or abandoning a known right, claim, or privilege; also : the legal instrument evidencing such an act.
Roll, pitch and yaw. Roll, pitch and yaw are rotations along the natural axes of the helicopter (or any aircraft). A rolling movement is where the helicopter rotates along a line along its length using lateral cyclic inputs (aileron), eventually turning from right way up to inverted while maintaining the helicopter's heading.
Helos have rotary blades that provide both lift and propulsion. That's the main difference, but there are many others; for instance, for twin seaters, a plane captain will seat on the left when a chopper captain sits on the right. On average, a plane requires less maintenance per hour of flight than a helicopter.