1 [uncountable and countable]
the act of suddenly taking control of something, especially by force
the Fascist seizure of power in 1922
2 [uncountable and countable]
when the police or government officers take away illegal goods such as drugs or guns:
a sudden condition in which someone cannot control the movements of their body, which continues for a short time [= fit]:
He had an epileptic seizure.