ad valorem tax
any tax imposed on the basis of the monetary value of the taxed item. Literally the term means "according to value." Traditionally, most customs and excises had "specific" rates; the tax base was defined in terms of physical units such as gallons, pounds, or individual items
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|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a chattering or flighty, light-headed person.|