incidence

Noun
  1. The relative frequency of occurrence of something (synset 113849172)
    is a type of: frequency, relative frequency - the ratio of the number of observations in a statistical category to the total number of observations
    subtypes: morbidity - the relative incidence of a particular disease
    same as: relative incidence
  2. The striking of a light beam on a surface (synset 111488396)
    "he measured the angle of incidence of the reflected light"
    is a type of: optical phenomenon - a physical phenomenon related to or involving light

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