Definition of rationale noun from the Oxford Advanced American Dictionary

     

    rationale

     noun
    noun
    NAmE//ˌræʃəˈnæl//
     
    rationale (behind/for/of something)(formal)
     
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  1. 1the principles or reasons that explain a particular decision, course of action, belief, etc. synonym reason
  2. 2 What is the rationale behind these new exams?
See the Oxford Advanced Learner's Dictionary entry: rationale