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.
Definition of Yaw. 1. v. i. To rise in blisters, breaking in white froth, as cane juice in the clarifiers in sugar works. 2. v. i. & t. To steer wild, or out of the line of her course; to deviate from her course, as when struck by a heavy sea; -- said of a ship. 3. n.