What does convulsion mean?
A convulsion is a violent, uncontrollable contraction of the muscles, most familiar as the physical manifestation of a seizure. In medicine it denotes the shaking and jerking that can occur when the brain's electrical activity is disrupted, whether through epilepsy, high fever, or other causes. The word also extends well beyond the body: writers use 'convulsions' to describe earthquakes, revolutions, financial crises, and any sudden upheaval that shakes a society to its foundations. A third, more literary sense captures intense emotional agitation — laughter or grief strong enough to seem physical. Derived from the Latin 'convellere', meaning to tear loose or wrench apart, the word has always carried connotations of force and violence. It is useful precisely because it bridges the clinical and the metaphorical: a single term that can describe both a patient's emergency-room crisis and a nation's political turmoil, lending gravity and urgency to whichever subject it touches.
nounA violent, involuntary contraction or series of contractions of the muscles, typically caused by a seizure; by extension, a sudden, violent disturbance or upheaval of a social, political, or natural kind.
- A violent, involuntary contraction or series of contractions of the muscles, as in an epileptic fit or febrile seizure.
- A sudden, violent, and widespread disturbance or upheaval in society, politics, or nature.
- (Usually in plural) An intense emotional agitation or paroxysm of feeling, especially laughter or grief.
"The earthquake sent convulsions through the ground for nearly a minute."
"The child was admitted to hospital after suffering convulsions during a high fever."
"The revolution plunged the country into political convulsions that lasted a generation."
The plural is the dominant form in both medical and figurative usage, reflecting that muscular spasms and large-scale upheavals typically occur in episodes rather than singly.
"The patient experienced several convulsions before the medication took effect."
The Latin verb behind 'convulsion' — 'vellere', to pluck or tear out — is the same root used for pulling hair and uprooting trees, which is fitting for a word that describes the body being violently shaken.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of convulsion
Convulsion derives from the Latin 'convulsio', from the verb 'convellere', meaning to tear loose, wrench away, or shake violently, formed from 'con-' (together) plus 'vellere' (to pluck or tear). The word entered English via Latin medical terminology, becoming established in English usage in the late sixteenth and early seventeenth centuries. Cognates sharing the same root include 'revulsion' and 'convulse', all preserving the original sense of a violent tearing or wrenching motion.
Related word forms
How convulsion is actually used
In medical contexts, 'convulsion' refers specifically to the motor manifestations of a seizure, and clinicians often prefer 'seizure' as the broader, more precise term. Outside medicine, the word carries a strong sense of violence and upheaval, so it suits figurative descriptions of wars, revolutions, and economic shocks. It appears in both formal writing and everyday speech, though its figurative use leans literary.
Easily confused with convulsion
A seizure is an episode of abnormal electrical activity in the brain, while a convulsion specifically refers to the violent involuntary muscle movements that may (but do not always) accompany one.
A spasm is a brief, localized involuntary muscle contraction, whereas a convulsion involves widespread, often whole-body muscular contractions.