ad valorem
adjective, adverb/ˌæd vəˈlɔːrem/
/ˌæd vəˈlɔːrem/
(finance)- (of a tax) according to the estimated value of the goods being taxedWord OriginLatin, ‘according to the value’.
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ad valorem
Definition of ad valorem adjective from the Oxford Advanced Learner's Dictionary