/keuhn vul"sheuhn/ , n.
1. contortion of the body caused by violent, involuntary muscular contractions of the extremities, trunk, and head.
2. violent agitation or disturbance; commotion.
3. an outburst of great, uncontrollable laughter.
[ 1575-85; convulsion- (s. of convulsio ). See CONVULSE, -ION ]