abatement       
noun [ U ] uk/əˈbeɪt.mənt/ us/əˈbeɪt.mənt/
 减少,减轻
a reduction in the amount or degree of something
  The tax abatement will save the business thousands of pounds. 减税将为企业节省数千英镑。 
 We need some noise abatement. 我们需要让噪音减小。 
 See: abate
 - More examples
 - A complete abatement of symptoms usually occurs within a few months.
 - Strict targets are being set for pollution abatement.
 - We went to the landlord and worked out an abatement of rent.