Meaning of “why” in the English Dictionary

"why" in English

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uk /waɪ/ us /waɪ/

A1 for what reason:

"I'm going home." "Why?"
Why did you choose to live in London?
Why wait? Let's leave now.
Why should I help him - he never helps me?
Why is it that I find chocolate so addictive?
The police asked me to explain why I hadn't reported the accident sooner.
I don't know why she isn't here.
Quite why he isn't here today is a mystery.
There is no reason why we shouldn't succeed.

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uk /waɪ/ us /waɪ/ mainly US or old-fashioned


uk /waɪ/ us /waɪ/
the whys and (the) wherefores

the reasons for something:

I know very little about the whys and the wherefores of the situation.

(Definition of “why” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"why" in American English

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whyconjunction, adverb [ not gradable ]

us /wɑɪ, hwɑɪ/

for what reason:

Why do you like living in Paris?
She’ll ask why you don’t have your homework.


(Definition of “why” from the Cambridge Academic Content Dictionary © Cambridge University Press)