What does endemic mean?

Question

I'm doing a biology report on the common cold and I keep reading that the common cold is endemic, what does it mean?

Answer 1

That it's commonly found, but in a low number of the population at any given time.

Answer 2

A disease that is constantly present to a greater or lesser degree in people of a certain class or in people living in a particular location.

Answer 3

Endemic is the disease present in a population or a geographical area all the time.