What's the difference between an epidemic and a pandemic?
From the OED:
1. Of a disease: ‘Prevalent among a people or a community at a special time, and produced by some special causes not generally present in the affected locality’ ( New Sydenham Soc. Lexicon).
2. In more extended sense: Wide-spread, widely prevalent, universal. Obsolete.
3. That is a product of a particular region; cf. epichorial adj. Obsolete.
An epidemic disease.
1. a. Of a disease: epidemic over a very large area; affecting a large proportion of a population. Also: of or relating to such a disease. Cf. epidemic adj.
b. gen. Frequently depreciative. General, universal, widespread.
2. Of or relating to physical or sensual love (as opposed to spiritual or divine love).
A pandemic disease; an outbreak of such a disease.