Definition of preemption
1 a
:the right of purchasing before others;
especially
:one given by the government to the actual settler upon a tract of public land
b
:the purchase of something under this right
2
:a prior seizure or appropriation :a taking possession before others
3
:a doctrine in law according to which federal law supersedes state law when federal law is in conflict with a state law
4
:a policy of launching a preemptive attack in order to prevent a suspected imminent attack
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