- 1[uncountable, countable] seizure (of something) the use of legal authority to take something from someone; an amount of something that is taken in this way The court ordered the seizure of his assets. the largest ever seizure of cocaine at a U.S. port
- 2[uncountable] seizure (of something) the act of using force to take control of a country, town, etc. the army's seizure of power the seizure of Burma by Japan in 1942
- 3[countable] a sudden attack of an illness, especially one that affects the brain Her seizures are now controlled by drugs. an epileptic seizure
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