Noun:

1. any tax in which the rate is constant as the amount subject to taxation increases

proportionaladj.成比例的；相称的n.[数]比例项proportional fairness比例公平proportional printing特 性串proportional revolver比例式旋转变压器proportional relation比例关系proportional guidance比例导引proportional integral比例积分proportional segments比例线段proportional diffServ比例区分服务proportional taxation比例税proportional dilution比例稀释

1. If the tax rate remains constant while the tax base varies in size, the tax is said to be proportional.
   当税基发生变化，税率恒定时，此税被认为是比例税。