(countable and uncountable, plural morbidities)
- The quality of being unhealthful, morbid
- (medicine) The incidence of a disease, as a rate of a population which is affected.
- (medicine, countable) An occurrence of illness or disease, or a single symptom of that illness.
- (medicine, countable) Adverse effects caused by a medical treatment such as surgery.
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".