Definition of convulsion noun from the Oxford Advanced Learner's Dictionary

     

    convulsion

     noun
    noun
    BrE BrE//kənˈvʌlʃn//
     
    ; NAmE NAmE//kənˈvʌlʃn//
     
    [usually plural](rather formal)
     
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  1. 1a sudden shaking movement of the body that cannot be controlled The child went into convulsions. synonym fit
  2. 2a sudden important change that happens to a country or an organization synonym upheaval political convulsions threatening the stability of new democracies
  3. Word Origin mid 16th cent. (originally in the sense ‘cramp, spasm’): from Latin convulsio(n-), from the verb convellere, from con- ‘together’ + vellere ‘to pull’.Extra examples The patient lost consciousness and went into convulsions. He felt a sudden convulsion of fear at the pit of his stomach. She started to have convulsions again. The drug can cause paranoia, memory loss and convulsions.
See the Oxford Advanced American Dictionary entry: convulsion