What does the term "adverse yaw" refer to?

The term "adverse yaw" describes the tendency of an aircraft to yaw in the opposite direction to its intended roll. This phenomenon occurs primarily due to the differential lift and drag produced by the ailerons when a pilot initiates a bank. As one aileron goes up to reduce lift on that wing, the opposite aileron goes down, increasing lift on the other wing. The increased lift results in increased drag on the wing with the lowered aileron, causing the aircraft to yaw away from the turn. Understanding this concept is crucial for pilots, as it affects the control of the aircraft during turns, and requires appropriate coordination with the use of rudder to maintain a smooth flight path.

The other options discuss aspects related to yaw but do not accurately define adverse yaw, which specifically involves this opposite yawing motion during a roll.