Definition of: incidence

(in′sə·dəns) noun
1. A falling, or the direction or manner of falling.
2. Physics The angle which the path of a body or of any form of radiant energy makes with the perpendicular of a surface at the point of impact.
3. The fact or the manner of being incident.
4. The degree of occurrence or effect of something: a high incidence of typhus.
5. Geom. Partial coincidence in the position of two figures, as a line and a point on it.