Definition of incidence noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈɪnsɪdəns//
    ; NAmE NAmE//ˈɪnsɪdəns//
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  1. 1[countable, usually singular] incidence of something (formal) the extent to which something happens or has an effect an area with a high incidence of crime
  2. 2 [uncountable] (physics) the way in which light meets a surface the angle of incidence
  3. Word Originlate Middle English (denoting a casual or subordinate event): from Old French, or from medieval Latin incidentia, from Latin incidere ‘fall upon, happen to’, from in- ‘upon’ + cadere ‘to fall’. Sense (1) dates from the early 19th cent.Extra examples The country had the lowest incidence of AIDS cases proportional to its population. The lack of vitamins may explain the higher incidence of heart disease. The medical histories of our patients show a high incidence of past diseases. The report analyses the incidence of cancer among people aged 0–24. The study noted an increased incidence of heart disease in women. There is a greater incidence of cancer in the families of radiation workers. They found an increased incidence of childhood leukaemia in some areas. We compared the incidence of coronary heart disease and total mortality. an incidence rate of 4 or 5 per 10 000 of the population the highest recorded incidence of air pollution
See the Oxford Advanced American Dictionary entry: incidence