abatement

noun | \ ə-ˈbāt-mənt \ | abate·ment

1. : the act or process of abating or the state of being abated challenged the abatement of her bequest abatement of a private nuisance by self-help —W. L. Prosser and W. P. Keeton

2. : an amount abated : deduction; especially : a deduction from the full amount of a tax : a deduction from the full amount of a tax