Definition of "preëmpted" [preempted]

• Simple past tense and past participle of preempt. (verb)

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• "The administration needs to show that S.B. 1070, Arizona's law authorizing state officials to enforce federal immigration law, is "preempted" - that it runs afoul of the Constitution's Supremacy Clause, which confirms that federal law supersedes state law."
• "FOX more or less intentionally killed it with a scheduling pillow-over-the-face: I recall hanging out at my friend Personal Demon’s house every Sunday night, only to find Futurama yet again preempted by Sunday Night Football."
• "In its lawsuit against Arizona, the Justice Department argues that the state statute is "preempted" by federal law because immigration enforcement is solely a federal prerogative."