/ Dictionary / Index A ad valorem tax: Meaning and Definition of Find definitions for: ad valo'rem tax" Pronunciation: [key] a tax levied according to the value of the property, merchandise, etc., being taxed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ad valorem advance Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language