n.
Pronunciation: k ə n- ' v ə l-sh ə n
Function: noun
Date: 1547
1 : an abnormal violent and involuntary contraction or series of contractions of the muscles
2 a : a violent disturbance b : an uncontrolled fit : PAROXYSM
– con · vul · sion · ary \ -sh ə - ˌ ner- ē \ adjective