Definition of why noun from the Oxford Advanced Learner's Dictionary

 

why

 noun
noun
BrE BrE//waɪ//
 
; NAmE NAmE//waɪ//
 
 
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Word Origin Old English hwī, hwȳ ‘by what cause’, instrumental case of hwæt ‘what’, of Germanic origin.Idioms
the whys and (the) wherefores
 
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the reasons for something I had no intention of going into the whys and the wherefores of the situation.
See the Oxford Advanced American Dictionary entry: why