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

ad valorem admeasured appraised evaluated gauged good for known by measurement mapped measured metered plotted priced prized pro rata quantified quantized rated surveyed triangulated valuated valued valued at worth