why Definition in Cambridge British English Dictionary
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Definition of "why" - British English Dictionary

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whyadverb

uk   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.
More examples

whyexclamation

uk   us   /waɪ/ mainly US or old-fashioned

whynoun

uk   us   /waɪ/
the whys and (the) wherefores the reasons for something: I know very little about the whys and the wherefores of the situation.
Translations of “why”
in Arabic لِماذا…
in Korean 왜…
in Malaysian mengapa…
in French pourquoi…
in Turkish neden, niçin, ne diye…
in Italian perché…
in Chinese (Traditional) 為甚麼…
in Russian почему?…
in Polish dlaczego, czemu…
in Vietnamese tại sao…
in Spanish por qué…
in Portuguese por que, por quê…
in Thai ทำไม…
in German warum…
in Catalan per què…
in Japanese どうして, なぜ…
in Indonesian mengapa…
in Chinese (Simplified) 为什么…
(Definition of why from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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