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Synonyms
con·vul·sion (kən-vŭĺshən)

noun 

  1. An intense, paroxysmal, involuntary muscular contraction.
  2. An uncontrolled fit, as of laughter; a paroxysm.
  3. Violent turmoil: “The market convulsions of the last few weeks have shaken the world” (Felix Rohatyn)