seizurePronunciation: /ˈsiːʒə/Translate seizure | into French | into German | into Italian | into Spanish Definition of seizure noun 1 [mass noun] the action of capturing someone or something using force:the seizure of the Assembly building the Nazi seizure of power the action of confiscating or impounding property by warrant of legal right: the seizure of all his assets seizures of heroin 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 US English dictionary