/ Dictionary / Index T tax-deductible: Meaning and Definition of Find definitions for: tax-de•duct•i•ble Pronunciation: (taks'di-duk"tu-bul), [key] — adj. noting an item the value or cost of which is deductible from the gross amount on which a tax is calculated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tax certificate tax deduction Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language