Definition of abatement
1
: the act or process of reducing or otherwise abating something
abatement of pollution
: the state of being abated
a storm continuing without abatement [=without weakening]
2
: an amount abated
especially
: a deduction from the full amount of a tax
… devised tax credits, refunds, and abatements to benefit private corporations … — William Greider
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Merriam-Webster unabridged
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Time Traveler for abatement
The first known use of abatement was in the 15th century
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