incidence
//ˈɪnsɪdəns//
Noun
incidenceSingular
incidencesPlural
1
The rate or frequency at which something occurs or affects a particular group or area.
The incidence of heart disease has increased in recent years.
2
The occurrence or instance of something happening.
There was a strange incidence at the office yesterday.
3
The way in which light or other radiation falls upon or strikes a surface.
The angle of incidence determines how much light is reflected off the surface.