contortion of the body caused by violent, involuntary muscular contractions of the extremities, trunk, and head.

violent agitation or disturbance; commotion.

an outburst of great, uncontrollable laughter.

noun

harmony , peace

noun

algospasm , attack , contortion , contraction , cramp , epilepsy , fit , paroxysm , seizure , throe , tremor , agitation , cataclysm , clamor , commotion , disaster , ferment , furor , outcry , quaking , rocking , seism , shaking , shock , tottering , trembling , tumult , turbulence , upheaval , upturn , disturbance , eclampsia , grand mal , laughter , orgasm , petit mal , spasm , uproar