reason Definition in the Cambridge English Dictionary
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Definition of “reason” - English Dictionary

Definition of "reason" - American English Dictionary

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reasonnoun

 us   /ˈri·zən/

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.

reasonverb

 us   /ˈri·zən/

reason verb (JUDGE)

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

reason verb (EXPLAIN)

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

Definition of "reason" - British English Dictionary

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reasonnoun

uk   us   /ˈriː.zən/

reason noun (EXPLANATION)

A2 [C or U] the ​cause of an ​event or ​situation or something that ​provides an ​excuse or ​explanation: The reason for the ​disaster was ​enginefailure, not ​humanerror. [+ question word] The reason why ​grass is ​green was a ​mystery to the little ​boy. [+ (that)] The reason (that) I'm ​calling is to ​ask a ​favour.not standard The reason I ​walked out was because I was ​bored. [+ to infinitive] The ​police have (every good) reason tobelieve that he is ​guilty. She was ​furious, and with reason (= with good ​cause). For some reason/For reasonsbestknown to himself (= for reasons no one ​elseknows about) he's ​decided to ​leave his ​job.by reason of formal because of: He's always ​asked to these ​occasions by reason of his ​position.
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reason noun (JUDGMENT)

[U] the ​ability of a ​healthymind to ​think and make ​judgments, ​especiallybased on ​practicalfacts: We ​humansbelieve that we are the only ​animals to have the ​power of reason.mainly UK old-fashioned He lost his reason (= ​becamementallyill) when both his ​parents were ​killed in the ​crash.within reason C2 within the ​limits of what is ​acceptable and ​possible: We can ​wear anything we like to the ​office, within reason.
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reasonverb [T]

uk   us   /ˈriː.zən/
to ​try to ​understand and to make ​judgmentsbased on ​practicalfacts: [+ (that)] Newton reasoned (that) there must be a ​force such as ​gravity I ​spenthours reasoning out the ​solution to the ​puzzle.
Phrasal verbs
(Definition of reason from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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