-rebatement-

n. [ OF. abatement, F. abattement. ] 1. 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. [ 1913 Webster ]

2. The amount abated; that which is taken away by way of reduction; deduction; decrease; a rebate or discount allowed. [ 1913 Webster ]

3. (Her.) A mark of dishonor on an escutcheon. [ 1913 Webster ]

4. (Law) The entry of a stranger, without right, into a freehold after the death of the last possessor, before the heir or devisee. Blackstone. [ 1913 Webster ]

Defense in abatement,
Plea in abatement, (Law), plea to the effect that from some formal defect (e.g. misnomer, lack of jurisdiction) the proceedings should be abated. [ 1913 Webster ]