angle of attack

noun

1. Also called, especially British, angle of incidence. Aeronautics. the acute angle between the chord of an aircraft wing or other airfoil and the direction of the relative wind.
2. Railroads. the angular attitude of a wheel flange to the rail, especially on curves.

noun

1. the acute angle between the chord line of an aerofoil and the undisturbed relative airflowAlso called: angle of incidence