What is the difference between etymology of epidemic and etymology of pandemic

If you are asking what they mean, and what the difference is, here is what i found.

Explanation:

An epidemic disease is one "affecting many persons at the same time, and spreading from person to person in a locality where the disease is not permanently prevalent." While a Pandemic is an epidemic that has spread over a large area, that is, it's "prevalent throughout an entire country, continent, or the whole world." Hope this makes sense!