/ Dictionary / Index B betterment tax: Meaning and Definition of Find definitions for: bet'terment tax" Pronunciation: [key] a tax on real property, for use by a government for the improvement of public property. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. betterment better-off Related Content Daily Word Quiz: meritocracy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language