Pre-emption right
（重定向自Preemptive right）
A pre-emption right, or right of pre-emption, is a contractual right to acquire certain property newly coming into existence before it can be offered to any other person or entity. Also called a "first option to buy." It comes from the Latin verb emo, emere, emi, emptum, to buy or purchase, plus the inseparable preposition pre, before. A right to acquire existing property in preference to any other person is usually referred to as a right of first refusal.