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English to English noun
| 1 |
the judicial principle asserting the supremacy of federal over state legislation on the same subject |  | source: wordnet30
| 2 |
the right of a government to seize or appropriate something (as property) | | source: wordnet30
| 3 |
the right to purchase something in advance of others | | source: wordnet30
| 4 |
a prior appropriation of something | | Example: the preemption of bandwidth by commercial interests
source: wordnet30
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