Definitions for: Incidence


[n] the striking of a light beam on a surface; "he measured the angle of incidence of the reflected light"
[n] the relative frequency of occurrence of something



Webster (1913) Definition: In"ci*dence, n. [Cf. F. incidence.]
1. A falling on or upon; an incident; an event. [Obs.] --Bp.
Hall.

2. (Physics) The direction in which a body, or a ray of light
or heat, falls on any surface.

In equal incidences there is a considerable
inequality of refractions. --Sir I.
Newton.

Angle of incidence, 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.

Line of incidence, the line in the direction of which a
surface is struck by a body, ray of light, and the like.

Synonyms: relative incidence

See Also: frequency, morbidity, optical phenomenon, relative frequency

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