preferentialadj.优先的；优待的；特惠的preferential rate优惠率,优待价preferential term优惠条件<款>preferential line优惠用户线preferential bill优惠票据preferential area优惠区域preferential shopn.工会会员可享特惠优待之商店preferential jack优先插塞preferential road优先通行路preferential field优先领域preferential stock[经] 优先股