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You use why in questions when you ask about the reasons for something. Why hasn't he brought the bill? Why didn't he stop me? Why can't I remember the exact year we married? The meaning of WHY is for what cause, reason, or purpose. How to use why in a sentence. Feb 10, 2026 · Adverb why (not comparable) (interrogative) For what cause, reason, or purpose. Introducing a complete question. Why definition: For what purpose, reason, or cause; with what intention, justification, or motive. a. for what reason, purpose, or cause?: why are you here?. b. (used in indirect questions): tell me why you're here.