The meaning of WHY is for what cause, reason, or purpose. How to use why in a sentence. WHY definition: 1. for what reason: 2. used to express surprise or anger: 3. the reasons for something. Learn more. When we ask for reasons in speaking, we can use the phrase why is that? In informal conversations we often say why’s that?: … Easy Learning Spanish Grammar. The word why serves as a fundamental tool in language for seeking explanations, expressing surprise, or delving into the reasons behind actions or phenomena. This small but powerful word is central to inquiry, understanding, and conversation. This disambiguation page lists articles associated with the title Why. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. /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 Here’s my new music video for my single “WHY. xx. a. for what reason, purpose, or cause?: why are you here?. b. (used in indirect questions): tell me why you're here. Annie Lennox - Why (Official Video) Listen on Spotify - Listen on Apple Music - Amazon - Follow.