Meaning of INCIDENCE in English

n.1 (often foll. by of) the fact, manner, or rate, of occurrence or action.

2 the range, scope, or extent of influence of a thing.

3 Physics the falling of a line, or of a thing moving in a line, upon a surface.

4 the act or an instance of coming into contact with a thing.

Phrases and idioms:

angle of incidence the angle which an incident line, ray, etc., makes with the perpendicular to the surface at the point of incidence.

Etymology: ME f. OF incidence or med.L incidentia (as INCIDENT)

Oxford English vocab.      Оксфордский английский словарь.