- 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. Abbreviation: aoi
- (on an airplane) the angle, usually fixed, between a wing or tail root chord and the axis of the fuselage.
- angle of attack (def. 1).
- the angle that a line or beam of radiation makes with the normal to the surface at the point of incidence
- another name for angle of attack
- the angle between the chord line of an aircraft wing or tailplane and the aircraft's longitudinal axis
