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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 ?
This haplotype represents a major, presumably highly transmissible MDR-associated clonal complex epidemically spreading across Eurasia (13).
According the WHO Global InfoBase, the prevalence of obesity between American adults in 2010 was 44.2% in men and 48.3% in women, and epidemically increases the worldwide.10This disease is more common among the world population and important contributors to poor health.11 This is a very difficult and multi-factorial disease arising from unnecessary storage of fat, resulting from the contribution of social, behavioral, cultural, psychological, metabolic and genetic factors.12
(17) Ex ante contractualists could reply that there is one important difference between V2 and V3* that I have overlooked--namely, that while in V3* it is merely epidemically uncertain who will die, in V2 it is objectively (or physically) uncertain who will die.
There is nothing of fatal character about the sickness but it completely knocks up those it attacks, for at least two or three days.' [24] Four summers later, in March 1878, the port town's district surgeon reported that 'this is the first time dengue has shown itself epidemically in this Colony, [25] and The Natal Mercury observed that 'at least every other person has suffered'.
rotavirus activity has substantially declined since the introduction of rotavirus vaccine, rotavirus disease continues to occur sporadically throughout the year and epidemically in a biennial winter-spring seasonal pattern, affecting even vaccinated persons (3).
The numbers are epidemically high: one in five children in Pakistan are sexually abused.
Epidemically, the implication is that the concept of whenever the basic reproduction number is less than unity, the ability to control the disease is no longer sufficient.