Angle of incidence
WordNet

noun


(1)   The angle that a line makes with a line perpendicular to the surface at the point of incidence
WiktionaryText

Noun



  1. 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.
  2. 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.
 
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