|1.||degree, extent, or frequency of occurrence; amount: a high incidence of death from pneumonia|
|2.||the act or manner of impinging on or affecting by proximity or influence|
|3.||physics See also angle of incidence the arrival of a beam of light or particles at a surface|
|4.||geometry the partial coincidence of two configurations, such as a point that lies on a circle|
incidence in·ci·dence (ĭn'sĭ-dəns)
The extent or rate of occurrence, especially the number of new cases of a disease in a population over a period of time.
The arrival of radiation or a projectile at a surface.