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the act or state of abating or the state of being abated; reduction; decrease; alleviation; mitigation.
suppression or termination:
abatement of a nuisance; noise abatement.
an amount deducted or subtracted, as from the usual price or the full tax.
Law.

a reduction of a tax assessment.
the termination of a nuisance.
a wrongful entry on land made by a stranger, after the owner’s death and before the owner’s heir or devisee has obtained possession.
a decrease in the legacies of a will when the assets of an estate are insufficient to pay all general legacies in full.

Also called rebatement. Heraldry. a charge or mark that, when introduced into a coat of arms, indicates the owner’s disgrace.
Historical Examples

When the Bezoar and the Grandduke’s oil failed to produce any abatement in the symptoms, the parish priest was sent for!
A Decade of Italian Women, v. II (of 2) T. Adolphus Trollope

The graciousness of her manner, however, underwent no abatement.
The Avenger E. Phillips Oppenheim

I don’t know who is; and I have no hope of getting any abatement.
The Absentee Maria Edgeworth

And yet what security is afforded by a present abatement of the visitation?
Journal of a Residence at Bagdad Anthony Groves

Will demanded, his anger gaining ground in proportion to the abatement of his fears.
The One-Way Trail Ridgwell Cullum

“Not at all,” said Lady Wolfer, with no abatement of her good humor.
Nell, of Shorne Mills Charles Garvice

One of his earliest acts was to advise Mr. Brooke to grant an abatement of 25 per cent.
Ireland Under Coercion (2nd ed.) (2 of 2) (1888) William Henry Hurlbert

Mendel himself led them on with an ardor that knew no abatement.
Rabbi and Priest Milton Goldsmith

Its abatement will be a work not of deliberation and design, but of defection through disuse.
An Inquiry Into The Nature Of Peace And The Terms Of Its Perpetuation Thorstein Veblen

The gale showed no signs of abatement, while the sea had continued to increase.
The Three Admirals W.H.G. Kingston

noun
diminution or alleviation; decrease
suppression or termination: the abatement of a nuisance
the amount by which something is reduced, such as the cost of an article
(property law) a decrease in the payment to creditors or legatees when the assets of the debtor or estate are insufficient to meet all payments in full
(property law) (formerly) a wrongful entry on land by a stranger who takes possession after the death of the owner and before the heir has entered into possession
n.

mid-14c., from Old French abatement, from abattre (see abate).