pre-emption

(noun) the judicial principle asserting the supremacy of federal over state legislation on the same subject. Synonyms: preemption.

(noun) the right of a government to seize or appropriate something (as property). Synonyms: preemption.

(noun) the right to purchase something in advance of others. Synonyms: preemption.

(noun) a prior appropriation of something. Synonyms: preemption. Example: "The preemption of bandwidth by commercial interests."