What is to best definition of an epidemic?

An epidemic is defined as the rapid spread of a disease among a large number of individuals within a specific population or geographic area, exceeding what is normally expected. It often involves Infectious Diseases but can also pertain to other health-related events. Epidemics can arise from various factors, including increased susceptibility to infection, environmental changes, and social behaviors. The term highlights a significant public health concern requiring immediate attention and intervention.