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Rotation around the longitudinal axis is referred to as roll. This movement involves tilting the aircraft from one wingtip to the other, akin to the way a log rolls along the ground. In aircraft dynamics, roll is one of the three primary axes of rotation, the other two being pitch (rotation around the lateral axis) and yaw (rotation around the vertical axis).

Understanding the concept of roll is crucial in aviation, as it directly affects the aircraft's ability to maneuver and maintain level flight. When an aircraft rolls, the pilot can induce turns and manage the bank angle, contributing to the overall control and responsiveness of the flight.

The other terms represent different types of rotations: pitch pertains to movements that tilt the nose up or down, while yaw involves rotating the aircraft around its vertical axis, causing the nose to move left or right. Skew is not a standard term used in aviation dynamics to describe rotation about any of the axes.