Etymology
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epidemic (adj.)

c. 1600, "common to or affecting a whole people," originally and usually, though not etymologically, in reference to diseases, from French épidémique, from épidemié "an epidemic disease," from Medieval Latin epidemia, from Greek epidemia "a stay in a place; prevalence of an epidemic disease" (especially the plague), from epi "among, upon" (see epi-) + dēmos "people, district" (see demotic). Also see -ic.

epidemic (n.)

1757, "an epidemic disease, a temporary prevalence of a disease throughout a community," from epidemic (adj.); earlier epideme (see epidemy). An Old English noun for this (persisting in Middle English) was man-cwealm.

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Definitions of epidemic
1
epidemic (n.)
a widespread outbreak of an infectious disease; many people are infected at the same time;
2
epidemic (adj.)
(especially of medicine) of disease or anything resembling a disease; attacking or affecting many individuals in a community or a population simultaneously;
an epidemic outbreak of influenza
From wordnet.princeton.edu