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ad valorem

[ad vuh-lawr-uh m, -lohr-] /æd vəˈlɔr əm, -ˈloʊr-/
adjective, adverb
in proportion to the value (used especially of duties on imports that are fixed at a percentage of the value as stated on the invoice).
Origin of ad valorem
< Latin: literally, according to the worth Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for ad valorem

ad valorem

/æd vəˈlɔːrəm/
adjective, adverb
(of taxes) in proportion to the estimated value of the goods taxed Abbreviation ad val, a.v., A/V
Word Origin
from Latin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ad valorem

type of customs duties, 1711, Latin, "in proportion to the value" (see value).

Online Etymology Dictionary, © 2010 Douglas Harper
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