ad valorem

英[,ædvә'lɔ:rem]

按价\n[法] 从价, 照价, 按值

A term used to denote a duty or charge laid upon goods,\n at a certain rate per cent upon their value, as stated in their\n invoice, -- in opposition to a specific sum upon a given quantity or\n number; as, an ad valorem duty of twenty per cent.