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diminution

noun [C or U]
 
 
/ˌdɪm.ɪˈnjuː.ʃən/ US  /-əˈnuː-/ formal

Definition

reduction in size or importance: Regular exercise can result in a general diminution in stress levels. The company suffered a diminution in profits.Becoming and making smaller or lessBecoming and making less strong
(Definition of diminution noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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