epilepsy

noun

ep·​i·​lep·​sy ˈe-pə-ˌlep-sē How to pronounce epilepsy (audio)
plural epilepsies
: any of various disorders marked by abnormal electrical discharges in the brain and typically manifested by sudden brief episodes of altered or diminished consciousness, involuntary movements, or convulsions

Examples of epilepsy in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Preston has autism, an intellectual and developmental disability and a rare form of epilepsy called Lennox-Gastaut syndrome. Eleanor Dearman, Fort Worth Star-Telegram, 2 July 2025 In 2015, Texas passed the Compassionate-Use Act, which allowed the first legal use of low-THC cannabis products in the state for patients with intractable epilepsy. Alexis Simmerman, Austin American Statesman, 2 July 2025 Legalized in 2018, it can be prescribed by specialist doctors for specific conditions such as severe epilepsy and multiple sclerosis. Dario Sabaghi, Forbes.com, 28 May 2025 Given the disease's rarity, it is often misdiagnosed initially as epilepsy or eye disease. Cheryl V. Jackson, IndyStar, 25 May 2025 See All Example Sentences for epilepsy

Word History

Etymology

Middle English epilencie, from Anglo-French & Latin; Anglo-French epelempsie, modification of Late Latin epilepsia, from Greek epilēpsia, from epilambanein to seize, from epi- + lambanein to take, seize — more at latch

First Known Use

1543, in the meaning defined above

Time Traveler
The first known use of epilepsy was in 1543

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Cite this Entry

“Epilepsy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epilepsy. Accessed 22 Jul. 2025.

Kids Definition

epilepsy

noun
ep·​i·​lep·​sy ˈep-ə-ˌlep-sē How to pronounce epilepsy (audio)
: a disorder marked by abnormal electrical discharges in the brain, by attacks of convulsions, and by loss of consciousness

Medical Definition

epilepsy

noun
ep·​i·​lep·​sy ˈep-ə-ˌlep-sē How to pronounce epilepsy (audio)
plural epilepsies
: any of various disorders marked by abnormal electrical discharges in the brain and typically manifested by sudden brief episodes of altered or diminished consciousness, involuntary movements, or convulsions see absence epilepsy, grand mal sense 1, petit mal sense 1 focal epilepsy, jacksonian epilepsy, myoclonic epilepsy, temporal lobe epilepsy

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