Definition of attrition noun from the Oxford Advanced American Dictionary

     

    attrition

     noun
    noun
    NAmE//əˈtrɪʃn//
     
    [uncountable](formal)
     
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  1. 1a process of making someone or something, especially your enemy, weaker by repeatedly attacking them or creating problems for them It was a war of attrition. These were the economics not of efficiency but of attrition.
  2. 2 the process of reducing the number of people who are employed by an organization by, for example, not replacing people who leave their jobs
See the Oxford Advanced Learner's Dictionary entry: attrition