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Noun convulsion has 4 senses
paroxysm, fit, convulsion - a sudden uncontrollable attack; "a paroxysm of giggling"; "a fit of coughing"; "convulsions of laughter"--1 is a kind of attack
 
convulsion - violent uncontrollable contractions of muscles--2 is a kind of seizure, ictus, raptus
 --2 has particulars: clonus; epileptic seizure
 
convulsion, turmoil, upheaval - a violent disturbance; "the convulsions of the stock market"--3 is a kind of disturbance, disruption, commotion, stir, flutter, hurly burly, to-do, hoo-ha, hoo-hah, kerfuffle
 
convulsion - a physical disturbance such as an earthquake or upheaval--4 is a kind of trouble
 
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