(ש"ע) הפחתה, שיכוך, הפגה

n. decrease, reduction, lessening, subsiding; reduction in some a sum that is owed (Law); suppression, annulment (Law); reduction of taxation faced by a company or person (Finance)

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Noun
1. an interruption in the intensity or amount of something
(synonym) suspension, respite, reprieve, hiatus
(hypernym) interruption, break
(hyponym) defervescence
(derivation) abate, let up, slack off, slack, die away
2. the act of abating; "laws enforcing noise abatement"
(hypernym) moderation
(hyponym) abatement of a nuisance, nuisance abatement

(n.)
The entry of a stranger, without right, into a freehold after the death of the last possessor, before the heir or devisee.
  

(n.)
The amount abated; that which is taken away by way of reduction; deduction; decrease; a rebate or discount allowed.
  

(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.
  

(n.)
A mark of dishonor on an escutcheon.
  

A reduction in some amount that is owed, usually granted by the person to whom the debt is owed. - (read more on Abatement)