Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “epidemic”


noun [C]    /ˌep·ɪˈdem·ɪk/
the appearance of a particular disease in a very large number of people during the same period of time : a flu epidemic
(Definition of epidemic noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of epidemic

Definitions of “epidemic” in other dictionaries

Word of the Day


to mix eggs with a little milk and mix again as they are being fried

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More