Definition of "morbidity"

morbidity

noun
countable and uncountable, plural morbidities
1. The quality of being unhealthful or diseased, sometimes including the cause.
2. The quality of being morbid; an attitude or state of mind marked by gloom.
  Quotations
  He taught him how to be superior to human foibles and how to give a godlike laugh at himself as a way of fending off morbidity. He did all the things for him that a woman is grateful for, except that Magnus is a man.
  1986, John le Carré, A Perfect Spy
3. (medicine) The incidence of a disease, as a rate of a population which is affected.
4. (medicine, countable) An occurrence of illness or disease, or a single symptom of that illness.
5. (medicine, countable) Adverse effects caused by a medical treatment such as surgery.
6. (demography, insurance) The sickness rate of a population.