Definition of morbidity
1 : the quality or state of being morbid especially : an attitude, quality, or state of mind marked by excessive gloom … there must have been some strange morbidity in his nature which made him take a grim pleasure in self-torture. — Somerset Maugham
2 : a diseased state or symptom : ill health Parasitic protozoans and helminths represent two major groups of infectious agents that are responsible for considerable morbidity and mortality in human and animal populations.— Adel A. F. Mahmoud also : a complication or undesirable side effect following surgery or medical treatment Because laryngectomy results in substantial functional morbidity, including the loss of the natural voice … alternative forms of treatment have been developed. — The New England Journal of Medicine
3 : the incidence of disease : the rate of illness (as in a specified population or group) Because the young lack immune capability, the morbidity of viral upper respiratory diseases often reaches 100 percent of kittens in a litter or household.— Margaret Reister also : the incidence of complications or undesirable side effects following surgery or medical treatment … radical prostatectomy in this setting … is associated with a very high morbidity. — Phillip W. Kantoff
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