名詞 preemption:

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

preemption 或 pre-emp.tion

n.（名詞）

The right to purchase something before others, especially the right to purchase public land that is granted to one who has settled on that land.
先買權(quán)：先于他人的購某物的權(quán)利，尤指給予公地定居者的購買該公地的權(quán)利
A purchase made by such a right.
先買：通過該種權(quán)利所進(jìn)行的購買
Prior seizure of, appropriation of, or claim to something, such as property.
先占：對(duì)某物如財(cái)產(chǎn)的搶先占有、占用或權(quán)利主張

來源：
pre-
pre-
Latin ômptiô ômptiôn- [buying] from ômptus past participle of Latin emere [to buy] * see em-
拉丁語 ômptiô ômptiôn- [買] 源自 ômptus 拉丁語 emere的過去分詞 [買] *參見 em-