Endemic, in a broad sense, can mean "belonging" or "native to", "characteristic of", or "prevalent in" a particular geography, race, field, area, or environment; native to an area or scope.
It also has two specific meanings:
Endemism, an organism being "endemic" means exclusively native to a place or biota
Endemic (epidemiology), an infection is said to be "endemic" in a human population when that infection is maintained in the population without the need for external inputs.
See also
Endemism in birds, relates to the definitions of endemism for birds only.
Epizoology, the study of infection and disease patterns in animal populations.
Zoonosis, any infectious disease that can be transmitted from animals to humans