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 (ĕp′ĭ-dĕm′ĭk) also ep·i·dem·i·cal (-ĭ-kəl)
1. Spreading rapidly and extensively by infection and affecting many individuals in an area or a population at the same time: an epidemic outbreak of influenza.
2. Widely prevalent: epidemic discontent.
1. An outbreak of a contagious disease that spreads rapidly and widely.
2. A rapid spread, growth, or development: an unemployment epidemic.

[French épidémique, from épidémie, an epidemic, from Old French espydymie, from Medieval Latin epidēmia, from Greek epidēmiā, prevalence of an epidemic disease, from epidēmos, prevalent : epi-, epi- + dēmos, people; see dā- in Indo-European roots.]

ep′i·dem′i·cal·ly adv.
References in periodicals archive ?
While in this case, it was reportedly the sisters' family members who brought them into the nightclub -- and there may not be an app that prevents family members from making dumb and dangerous decisions -- owners and managers of nightclubs, restaurants, bars, liquor stores and other establishments where fake IDs are used epidemically no longer have an excuse, as they now have access to a game-changing technology that can expose fake IDs with the push of a button.
As medical professionals observed the courses of influenza outbreaks, both in Europe and in the United States, it appeared that influenza took different forms depending upon whether it occurred sporadically, epidemically, or pandemically (Ritchie, Matthews, and Goodall 1917, 31).
HCV infections are distributed worldwide and have spread epidemically within the past 40-60 years within western countries through blood-borne routes such as blood and blood product transfusion and injection drug use.