Meaning of REASONING in English

REASONING

/ ˈriːzənɪŋ; NAmE / noun

[ U ] the process of thinking about things in a logical way; opinions and ideas that are based on logical thinking :

What is the reasoning behind this decision?

This line of reasoning is faulty.

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