Definition of mitigation noun from the Oxford Advanced American Dictionary

 

mitigation

 noun
noun
NAmE//ˌmɪt̮əˈɡeɪʃn//
 
[uncountable](formal)
 
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  • a reduction in how unpleasant, serious, etc. something is
  • Idioms
    in mitigation(law)
     
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    with the aim of making a crime seem less serious or easier to forgive In mitigation, the defense lawyer said his client was seriously depressed at the time of the assault.
    See the Oxford Advanced Learner's Dictionary entry: mitigation