definition of
convulsion

[1] #1 convulsion n. [paroxysm, fit] a sudden uncontrollable attack; "a paroxysm of giggling"; "a fit of coughing"; "convulsions of laughter". wn

[2] #2 convulsion n. violent uncontrollable contractions of muscles. wn

[3] #3 convulsion n. [turmoil, upheaval] a violent disturbance; "the convulsions of the stock market". wn

[4] #4 convulsion n. a physical disturbance such as an earthquake or upheaval. wn