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angle of incidence

noun
1.
Also called incidence. 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.
2.
(on an airplane) the angle, usually fixed, between a wing or tail root chord and the axis of the fuselage.
3.
Chiefly British, angle of attack (def 1).
Origin
1620-1630
1620-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for angle incidence

angle of incidence

noun
1.
the angle that a line or beam of radiation makes with the normal to the surface at the point of incidence
2.
another name for angle of attack
3.
Also called rigging angle of incidence. the angle between the chord line of an aircraft wing or tailplane and the aircraft's longitudinal axis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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angle incidence in Science
angle of incidence  
The angle formed by a ray or wave, as of light or sound, striking a surface and a line perpendicular to the surface at the point of impact.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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