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Noun convulsion has 4 senses
  1. paroxysm, fit, convulsion - a sudden uncontrollable attack; "a paroxysm of giggling"; "a fit of coughing"; "convulsions of laughter"
    --1 is a kind of attack
  2. convulsion - violent uncontrollable contractions of muscles
    --2 is a kind of
    seizure, ictus, raptus
    --2 has particulars: clonus; epileptic seizure
    Derived forms: verb convulse5, verb convulse6, verb convulse1
  3. 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
  4. convulsion - a physical disturbance such as an earthquake or upheaval
    --4 is a kind of
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