|Origin:||épidémique, from Greek epidemos 'visiting'|
a large number of cases of a disease that happen at the same time [↪ pandemic]:
Over 500 people died during last year's flu epidemic.
an epidemic of cholera
a sudden increase in the number of times that something bad happens
Britain is suffering an epidemic of petty crime.
—epidemic adjective [only before noun]
Violent crime is reaching epidemic proportions in some cities.