Incidence

Origin

From Middle French incidence, from Medieval Latin incidentia ("a falling upon"), from Latin incidens, present participle of incidere ("to fall upon"), from in ("on") + cadere ("to fall").

Noun

1. The act of something happening; occurrence
2. The extent, or the relative frequency of something happening
3. (physics) The striking of radiation or a projectile upon a surface
4. (epidemiology) A measure of the risk that a person develops a new condition within a specified period of time, usually a year.

Derived terms

• angle of incidence
• incidence algebra
• incidence axiom
• incidence function
• incidence geometry
• incidence graph
• nonincidence

Related terms

• incident