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abatement

abatement ə-bāt-mənt n 1
:the act or process of abating or the state of being abated challenged the ⁓ of her bequest ⁓ of a private nuisance by self-help W. L. Prosser and W. P. Keeton
2
:an amount abated
:deduction
esp
:a deduction from the full amount of a tax
in abatement
:subject to termination because of a formal or procedural defect there shall be no reversal in the Supreme Court…for error in ruling upon matters in abatement U.S. Code