Plain English Meaning
How fast the nose of the airplane is moving sideways, left or right, measured in degrees per second.
Full Definition
The speed at which an airplane rotates about its vertical axis, expressed in degrees per second. Yaw rate measures how quickly the nose is swinging left or right, and is the parameter sensed and controlled by a yaw damper to suppress unwanted oscillations such as Dutch roll.
Context Anchor
Seen in yaw damper discussions, where the system senses unwanted left-right nose motion and helps reduce it.
Derivation
Yaw comes from an old nautical term meaning to deviate or stray off course. Rate simply means how fast something is changing. Together it describes how quickly the nose is straying from its .