Meaning of RATIONALE in English

RATIONALE

/ ˌræʃəˈnɑːl; NAmE -ˈnæl/ noun

rationale (behind / for / of sth) ( formal ) the principles or reasons which explain a particular decision, course of action, belief, etc.

SYN reason :

What is the rationale behind these new exams?

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WORD ORIGIN

mid 17th cent.: modern Latin , neuter (used as a noun) of Latin rationalis endowed with reason, from ratio(n-) reckoning, reason, from rat- reckoned, from the verb reri .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.