noun
A Latin term meaning 'according to value' used in finance and taxation to refer to a tax or charge based on the assessed value of a transaction or property.
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The ad valorem tax is calculated based on the value of the goods being imported.
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I heard they're charging an ad val tax on all luxury items.
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I can't believe how much ad val they're adding to these products!
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The ad val of her kindness cannot be measured in material terms.