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pre-emption (n.)

also preemption, c. 1600, "a purchase by one before an opportunity is offered to others," originally as a right; literally "a purchasing before others," from pre- "before" + emption "purchase."

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Definitions of pre-emption from WordNet

pre-emption (n.)
the judicial principle asserting the supremacy of federal over state legislation on the same subject;
Synonyms: preemption
pre-emption (n.)
the right of a government to seize or appropriate something (as property);
Synonyms: preemption
pre-emption (n.)
the right to purchase something in advance of others;
Synonyms: preemption
pre-emption (n.)
a prior appropriation of something;
Synonyms: preemption
From wordnet.princeton.edu