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Definition of diminution noun from the Oxford Advanced American Dictionary

      

    diminution

     noun
    noun
    NAmE//ˌdɪməˈnuʃn//
     
    diminution (of/in something) (formal)
     
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  1. 1[uncountable] the act of reducing something or of being reduced the diminution of political power
  2. 2[countable, usually singular] a reduction; an amount reduced a diminution in population growth
See the Oxford Advanced Learner's Dictionary entry: diminution