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|Noun||1.||incidence angle - the angle that a line makes with a line perpendicular to the surface at the point of incidence|
angle - the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
angle of attack - the acute angle between the direction of the undisturbed relative wind and the chord of an airfoil
critical angle - the smallest angle of incidence for which light is totally reflected