epidemic

American  

[ep-i-dem-ik] / ˌɛp ɪˈdɛm ɪk /

adjective

1. Also epidemical (of a disease) affecting many persons at the same time, and spreading from person to person in a locality where the disease is not permanently prevalent.

2. extremely prevalent; widespread.

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noun

1. a temporary prevalence of a disease.

2. a rapid spread or increase in the occurrence of something.

   an epidemic of riots.

epidemic British  

/ ˌɛpɪˈdɛmɪk /

adjective

1. (esp of a disease) attacking or affecting many persons simultaneously in a community or area

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noun

1. a widespread occurrence of a disease

   an influenza epidemic

2. a rapid development, spread, or growth of something, esp something unpleasant

   an epidemic of strikes

epidemic Scientific  

/ ĕp′ĭ-dĕm′ĭk /

1. An outbreak of a disease or illness that spreads rapidly among individuals in an area or population at the same time.

2. See also endemic pandemic

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epidemic Cultural  

1. A contagious disease that spreads rapidly and widely among the population in an area. Immunization and quarantine are two of the methods used to control an epidemic.

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Other Word Forms

• epidemically adverb
• epidemicity noun
• interepidemic adjective
• preepidemic noun

Etymology

Origin of epidemic

First recorded in 1595–1605; obsolete epidem(y) (from Late Latin epidēmia, from Greek epidēmía “staying in one place, among the people,” equivalent to epi- epi- + dêm(os) “people of a district” + -ia -y ³ ) + -ic

Explanation

An epidemic is a disease that spreads rapidly among many people in a community at the same time. In the 1980s, the fast-spreading AIDS epidemic transformed life on our planet. Epidemic can be used figuratively to refer to something that spreads or grows rapidly: an epidemic of laziness has taken over the tenth grade. This word is from French épidémique, ultimately from Greek epidēmia "staying in one place, among the people." The related word pandemic refers to a disease that spreads throughout an entire country or throughout the world.

Example Sentences

I’m part of an epidemic among retirees, I’m convinced.

From The Wall Street Journal • Apr. 12, 2026

At the same time, chronic pain remains a widespread and costly condition, often described as a 'silent epidemic.'

From Science Daily • Mar. 28, 2026

“This action seeks justice for a decorated American athlete who, in his pursuit of Olympic glory, was knowingly sacrificed to a silent epidemic of brain injury,” the court filing said.

From Los Angeles Times • Mar. 23, 2026

The outcome of the trial is expected to establish a precedent for resolving other lawsuits that blame social media for fueling an epidemic of mental and emotional trauma.

From Barron's • Mar. 21, 2026

Philadelphia health officials have issued a warning bulletin about the influenza epidemic.

From "Moon Over Manifest" by Clare Vanderpool

Related Words

• contagion
• outbreak
• pest
• plague
• rash
• scourge
• spread
• wave