angle of incidence
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- (optics, physics) The angle that a straight line, ray of light, etc., meeting a surface, makes with a normal to the surface at the point of meeting.
- (aeronautics) The angle, usually fixed, between the chord line of a wing or horizontal stabilizer and the axis of the fuselage, measured at the root.
- (angle between wing and axis of fuselage): angle of attack (UK)
angle that a straight line makes with the normal of a surface