American Heritage® Dictionary of the English Language, Fourth Edition
- n. The angle formed by a ray incident on a surface and a perpendicular to the surface at the point of incidence.
- n. 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.
- n. 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. In UK called the angle of attack.
GNU Webster's 1913
- (Aëronautics) The angle between the chord of an aërocurve and the relative direction of the undisturbed air current.
- n. the angle which a ray of light, or the line of incidence of a body, falling on any surface, makes with a perpendicular to that surface; also formerly, the complement of this angle.
- n. the angle that a line makes with a line perpendicular to the surface at the point of incidence
“The angle of incidence is understood as defined by Alhazen and Vitellio”
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