| Noun | 1. | convulsion - a sudden uncontrollable attack; "a paroxysm of giggling"; "a fit of coughing"; "convulsions of laughter"attack - a sudden occurrence of an uncontrollable condition; "an attack of diarrhea" | |
| 2. | convulsion - violent uncontrollable contractions of musclesictus, raptus, seizure - a sudden occurrence (or recurrence) of a disease; "he suffered an epileptic seizure" clonus - convulsion characterized by alternating contractions and relaxations | |
| 3. | convulsion - a violent disturbance; "the convulsions of the stock market" | |
| 4. | convulsion - a physical disturbance such as an earthquake or upheavaltrouble - an event causing distress or pain; "what is the trouble?"; "heart trouble" | |