Abatement

noun

1. The act of abating, or the state of being abated; a lessening, diminution, or reduction; a moderation; removal or putting an end to; the suppression of.

   "The abatement of a nuisance is the suppression thereof."

2. The amount abated; that which is taken away by way of reduction; deduction; decrease; a rebate or discount allowed; in particular from a tax.
3. A mark of dishonor on an escutcheon; any figure added to the coat of arms tending to lower the dignity or station of the bearer.