What does epilepsy mean?
Epilepsy is a chronic neurological disorder characterised by a tendency to experience recurrent, unprovoked seizures — brief disruptions of normal brain function caused by sudden bursts of abnormal electrical activity. These events range from momentary lapses in awareness to convulsions affecting the whole body. Epilepsy is one of the most common neurological conditions worldwide, affecting people of all ages, and while its causes vary (including genetic factors, head injury, stroke, and infections), many cases have no identifiable origin. The word functions as an uncountable noun: one 'has epilepsy' or is 'diagnosed with epilepsy', and individual episodes are called seizures rather than instances of the disease itself. Modern antiseizure medications, surgery, and lifestyle management allow most people with epilepsy to control their symptoms effectively. Because misconceptions and stigma have historically surrounded the condition, precise, respectful language matters; describing someone as 'a person with epilepsy' is generally preferred over older labels.
nounA neurological disorder characterized by recurrent, unprovoked seizures, caused by abnormal electrical activity in the brain.
- A chronic neurological disorder marked by recurrent unprovoked seizures due to abnormal electrical discharges in the brain.
"She has lived with epilepsy since childhood but manages it well with medication."
"He was diagnosed with temporal lobe epilepsy at the age of nine."
"Advances in treatment have made it possible for many people with epilepsy to live seizure-free lives."
Rarely used; epilepsy is almost always treated as uncountable. The plural appears only in technical medical contexts distinguishing different types of the disorder.
"Childhood epilepsies differ significantly in their causes and prognoses."
The word epilepsy comes from the Greek for 'seizure' — literally 'to seize upon' — reflecting how ancient people saw the condition as something that takes hold of the body.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of epilepsy
Epilepsy derives from the ancient Greek 'epilēpsía' (ἐπιληψία), meaning 'a seizure' or 'attack', formed from 'epilambanein' — 'to seize upon' or 'take hold of' — combining 'epi-' ('upon') and 'lambanein' ('to take'). The Greeks also called it 'the sacred disease' because of the mysterious nature of its fits. The term passed into Latin as 'epilepsia' and entered English via Old French and Latin in the late Middle Ages, becoming established in English medical vocabulary by the early modern period. Related English words sharing this root include 'epileptic' and 'epileptiform'.
Related word forms
How epilepsy is actually used
Epilepsy is an uncountable noun in standard usage — one does not say 'an epilepsy'. The term is neutral and clinical; avoid stigmatising language such as 'epileptic fit' in favour of 'seizure' when referring to individual events. A person may be described as 'having epilepsy' rather than 'being epileptic', though both are widely understood.
Easily confused with epilepsy
Narcolepsy is a disorder causing sudden sleep attacks, whereas epilepsy causes recurrent seizures from abnormal brain activity.