ad v.

ad valorem; ad val., ad v., a/v According to value. Referring to taxes: 'In proportion to invoiced value of goods.' A term used when imposing customs and stamp duty, the duty increasing according to the value of the transaction of goods involved. Pronounced in English as: ad vuh LOH ruhm.
Found on http://www.wordinfo.info/words/index/info/view_unit/2262/
No exact match found