Noah Webster's Dictionary 1. (n.) The act of abating, or the state of being abated; a lessening, diminution, or reduction; removal or putting an end to; as, the abatement of a nuisance is the suppression thereof. 2. (n.) The amount abated; that which is taken away by way of reduction; deduction; decrease; a rebate or discount allowed. 3. (n.) A mark of dishonor on an escutcheon. 4. (n.) The entry of a stranger, without right, into a freehold after the death of the last possessor, before the heir or devisee.

Multi-Version Concordance Abatement (1 Occurrence) Leviticus 27:18 But if he dedicates his field after the Jubilee, then the priest shall reckon to him the money according to the years that remain to the Year of Jubilee; and an abatement shall be made from your valuation. (WEB JPS ASV)