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

incidence

incidenceclick for a larger image
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.