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1. Oxford American Dictionary

   preemption

   • IPA[prēˈem(p)SH(ə)n]

   美式

   • n.
     the purchase of goods or shares by one person or party before the opportunity is offered to others；the right to purchase public land by preemption.

   • noun: pre-emption

2. • 釋義

   n.

   名詞

   • 1. the purchase of goods or shares by one person or party before the opportunity is offered to others the commission had the right of preemption
   • ▪ North American historical the right to purchase public land by preemption.
   • 2. the action of preempting or forestalling, especially of making a preemptive attack damaging retaliation for any attempt at preemption
   • ▪ US the interruption or replacement of a scheduled radio or television program.