incidence

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incidence

1. Physics the arrival of a beam of light or particles at a surface
2. Geometry the partial coincidence of two configurations, such as a point that lies on a circle
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

incidence

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The angular distance between the chord and a line drawn longitudinally through the fuselage. It is determined during the design of the airplane and is the angle at which the wing is attached to the fuselage. Hence, it is a fixed angle. Also called riggers' angle of incidence.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved