Angle-incidence

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:
1620–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
angle of incidence
 
n
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 10th Edition
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American Heritage
Science Dictionary
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
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