AI-generated content may sometimes contain inaccurate, incomplete, or biased information, so make sure you do additional research. You should not rely on this feature for medical, financial, or legal advice. Why Do YouTube and MP3 Sound So Different We weren’t able to create a summary for you. Refresh your page to try again. Apr 4, 2026 · The meaning of WHY is for what cause, reason, or purpose. How to use why in a sentence. When we ask for reasons in speaking, we can use the phrase why is that? In informal conversations we often say why’s that?: … 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? for what reason, purpose, or cause?: why are you here?. (used in indirect questions): tell me why you're here. /waɪ/ IPA guide Other forms: whys Definitions of why noun the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores' synonyms: wherefore Definition of why adverb in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.