the purchase of goods or shares by one person or party before the opportunity is offered to others 优先购买 the commission had the right of pre-emption. 委员会有优先购买权。 ■(historical, chiefly N. Amer. & Austral.)the right to purchase public land in this way (史,主北美,主澳)公共土地优先购买权
the action of pre-empting or forestalling, especially of making a pre-emptive attack 抢先占有;先发制人(尤指抢先攻击) damaging retaliation for any attempt at pre-emption. 对任何企图先发制人的毁灭性报复。 ■(N. Amer.)the interruption or replacement of a scheduled radio or television programme (北美)(广播或电视节目的)插播,替换
语源
early 17th cent.: from medieval Latin praeemptio(n-), from the verb praeemere, from prae 'in advance' + emere 'buy'