con·vul·sion 
/kənˈvʌlʃən/ noun
plural con·vul·sions /kənˈvʌlʃən/ noun [count] 1 a medical : a sudden violent shaking of the muscles in your body that you are unable to control — usually plural ▪ The patient suffers from convulsions. ▪ He suddenly went into convulsions.
b : a sudden experience of something (such as laughter) that shakes or moves your body — usually plural ▪ The joke sent the audience into convulsions of laughter. 2 : a sudden change or disturbance that affects a country, organization, etc. — usually plural ▪ an era of political convulsions [=upheavals] ▪ The controversial exhibit caused convulsions in the artistic community.
b : a sudden experience of something (such as laughter) that shakes or moves your body — usually plural ▪ The joke sent the audience into convulsions of laughter.
