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English definition of “reason”

reason

noun  /ˈri·zən/ us  

reason noun (EXPLANATION)

[C/U] the cause of an event or situation, or something suggested as an explanation: [C] She had never stopped by before for any reason. [C] There must be a reason why she’s not here yet. [U] Adams had good reason to fire Pickering.

reason noun (JUDGMENT)

[U] the ability to think and make judgments, esp. good judgments: Meditation seemed to have improved her ability to reason.

reason

verb  /ˈri·zən/ us  

reason verb (JUDGE)

to think about and make a good judgment about: [+ (that) clause] He reasoned (that) he had only four or five years left as an athlete.

reason verb (EXPLAIN)

to argue with and try to persuade someone: [I] Grace kept her voice gentle, as if she were reasoning with a child.
reasoning
noun [U]  /ˈri·zə·nɪŋ/ us  
I didn’t follow her reasoning.
(Definition of reason from the Cambridge Academic Content Dictionary © Cambridge University Press)
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