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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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the principles or reasons that explain a particular decision, course of action, belief, etc. synonym reason What is the rationale behind these new exams?
See rationale in the Oxford Advanced Learner's Dictionary