incidence
1. [ noun ] (statistics) the relative frequency of occurrence of something
Synonyms: relative_incidence
Related terms: frequency morbidity
2. [ noun ] (physics) the striking of a light beam on a surface
Examples:

"he measured the angle of incidence of the reflected light"

Related terms: optical_phenomenon
Similar spelling:   incident
  inside
  incidental
  insider
  incitive
  inactive
  inaction
  incidentally
  inactiveness
  incite
  inside-out
  inside_out
  inside_job
  incitement
  instance
  inside_loop
  inciter
  inactivate