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In medicine, epidemiology and actuarial science, the term '''morbidity''' can refer to

★ the state of being diseased (from Latin ''morbidus'': sick, unhealthy),

★ the degree or severity of a disease,

★ the prevalence of a disease: the ''total'' number of cases in a particular population at a particular point in time,

★ the incidence of a disease: the number of ''new'' cases in a particular population during a particular time interval.

★ disability irrespective of cause (e.g., disability caused by accidents).
The term '''morbidity rate''' can refer either to the incidence rate or to the prevalence rate of a disease. Compare this with the mortality rate of a condition, which is the number of people dying during a given time interval, divided by the total number of people in the population. Morbidity is often what is measured by ICU scoring systems.