1.Definition: a physical disturbance such as an earthquake or upheaval

Category: General

2.Definition: a sudden uncontrollable attack

"A paroxysm of giggling", "A fit of coughing", "Convulsions of laughter"

Related Noun(s):fit, paroxysm

Category: General

3.Definition: a violent disturbance

"The convulsions of the stock market"

Related Noun(s):turmoil, upheaval

Category: General

4.Definition: violent uncontrollable contractions of muscles

Category: General