noun. ['kənˈvʌlʃən'] a physical disturbance such as an earthquake or upheaval.
noun. ['kənˈvʌlʃən'] violent uncontrollable contractions of muscles.
noun. ['kənˈvʌlʃən'] a violent disturbance.
noun. ['kənˈvʌlʃən'] a sudden uncontrollable attack.