GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Incidence , n. [Cf. F. incidence.]
   1913 Webster
   A falling on or upon; an incident; an event; an occurrence. [Obs.]
   Bp. Hall.
   
   1913 Webster
   (Physics) The direction in which a body, or a ray of light or heat, falls on any surface.
   1913 Webster
   In equal incidences there is a considerable inequality of refractions.
   Sir I. Newton.
   
   1913 Webster
   The rate or ratio at which something occurs; as, the incidence of murder in Los Angeles; the incidence of cancer in men over 50.
   PJC
   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.
   1913 Webster