n. The act of abating, or the state of being abated; diminution, decrease, reduction, or mitigation: as, abatement of grief or pain.n. The amount, quantity, or sum by which anything is abated or reduced; deduction; decrease.n. In heraldry, a mark annexed to coat-armor, in order to denote some dishonorable act of the person bearing the coat of arms, or his illegitimate descent.n. In law: Removal or destruction, as of a nuisance.n. Failure; premature end; suspension or diminution, as of an action or of a legacy. See abate.n. The act of intruding on a freehold vacated by the death of its former owner, and not yet entered on by the heir or devisee.n. In revenue law:n. A deduction from or refunding of duties on goods damaged during importation or in store.n. A deduction from the amount of a tax. The mode of abatement is prescribed by statute.n. In carpentry, the waste of a piece of stuff caused by working it into shape.n. Rebate, allowance, deduction, discount, mitigation.