Incidence is a term used to describe the OCCURRENCE of an EVENT. It is often used in the context of epidemiology, where it is used to describe the rate of OCCURRENCE of a disease or other health-related issue. In this context, incidence can also refer to the number of new cases of a particular disease or condition that occur within a given population over a specified period of time. In other contexts, incidence can refer to the frequency of an EVENT or the probability of its OCCURRENCE.