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Recorded since 1656; from morbid, from Latin morbidus (diseased), from morbus (disease), from the root of mori (to die) or from a Proto-Indo-European base mor "to rub, pound, wear away".


morbidity (countable and uncountable, plural morbidities)

  1. The quality of being unhealthful, morbid, sometimes including the cause.
  2. (medicine) The incidence of a disease, as a rate of a population which is affected.
  3. (medicine, countable) An occurrence of illness or disease, or a single symptom of that illness.
  4. (medicine, countable) Adverse effects caused by a medical treatment such as surgery.


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