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  • noun
    plural -dences
    [count] the number of times something happens or develops :the rate at which something occurs
    an increased incidence of diabetes
    a high/low incidence of criminal behavior
    a disease with an incidence of one in 100,000 [=a disease that affects one person out of every 100,000]
    technical :the angle at which a ray (such as a ray of light) hits a surface
    the angle of incidence