adjective
relating to a tax or duty imposed based on the value of the item being taxed
adverb
in a manner related to the value of the item being taxed
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The import tax is calculated ad valorem based on the value of the goods.
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The sales tax is ad valorem, meaning it's a percentage of the total purchase price.
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I hate paying ad valorem taxes on my property because they keep going up.
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Her love for him was ad valorem, increasing with each passing day.