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convulsion /kənˈvʌlʃən/  

  • noun
    plural -sions
    [count] a medical :a sudden violent shaking of the muscles in your body that you are unable to control - usually plural
    a sudden experience of something (such as laughter) that shakes or moves your body - usually plural
    a sudden change or disturbance that affects a country, organization, etc. - usually plural