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Noun: incidence  in-si-dun(t)s
  1. The relative frequency of occurrence of something
    - relative incidence
  2. The striking of a light beam on a surface
    "he measured the angle of incidence of the reflected light"
  3. An instance of something happening

Sounds like: in, ence, incid

Derived forms: incidences

Type of: frequency, optical phenomenon, relative frequency

Encyclopedia: Incidence