Common to, or affecting at the same time, a large number in a community; - applied to a disease which, spreading widely, attacks many persons at the same time; as, an epidemic disease; an epidemic catarrh, fever, etc. See Endemic.
Spreading widely, or generally prevailing; affecting great numbers, as an epidemic does; as, epidemic rage; an epidemic evil.
An epidemic disease.
Anything which takes possession of the minds of people as an epidemic does of their bodies; as, an epidemic of terror.