seizure Syllabification: (sei·zure)Pronunciation: /ˈsēZHər/Translate seizure | into French | into German | into Italian | into Spanish Definition of seizure noun 1the action of capturing someone or something using force:the seizure of the Assembly building another seizure of power by the military the action of confiscating or impounding property by warrant of legal right. 2a sudden attack of illness, especially a stroke or an epileptic fit:the patient had a seizureseizure in other Oxford dictionaries Definition of seizure in the British & World English dictionary