pre-emption

名词 pre-emption:

1. the judicial principle asserting the supremacy of federal over state legislation on the same subject
   同义词：preemption
2. the right of a government to seize or appropriate something (as property)
   同义词：preemption
3. the right to purchase something in advance of others
   同义词：preemption
4. a prior appropriation of something
   同义词：preemption