from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The angle formed by a ray incident on a surface and a perpendicular to the surface at the point of incidence.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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. 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.
from the GNU version of the Collaborative International Dictionary of English
- 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the angle that a line makes with a line perpendicular to the surface at the point of incidence
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