Real Dictionary

seizure
countable noun: If a financial institution or a government makes a seizure of someone's assets, they take their money or property from them because they have not paid money that they owe.
countable noun: If someone has a seizure, they have a sudden violent attack of an illness, especially one that affects their heart or brain.
countable noun: If there is a seizure of power or a seizure of an area of land, a group of people suddenly take control of the place, using force.
countable noun: When an organization such as the police or customs service makes a seizure of illegal goods, they find them and take them away.

seizure in American English
the act of one who seizes, or an instance of this
noun: the act or an instance of seizing

seizure in British English
noun: the act or an instance of seizing or the state of being seized