Morbidity refer to the number of cases of a disease that exist at a given point in time; it may be expressed as the number of new cases (incidence) or as the total number of existing cases (prevalence ); the extent of injury, illness or disability in a defined population. It is usually expressed in general or specific rates of prevalence or incidence.
Likewise, Morbidity refer to the various forms of physical and functional consequences and limitations that result from an illness; number of cases of a disease that exist at a given point in time.
Other /More definition:
morbidity is the various forms of physical and functional consequences and limitations that result from an illness.