Why is my variable undefined javascript. 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. for what reason, purpose, or cause?: why are you 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 an introductory expression of surprise, disagreement, indignation, etc: why, don't be silly! Etymology: Old English hwī; related to Old Norse hvī, Gothic hveileiks what kind of, Latin quī Feb 10, 2026 · Adverb why (not comparable) (interrogative) For what cause, reason, or purpose. Why hasn't he brought the bill? Why didn't he stop me? Why can't I remember the exact year we married? a. How to use why in a sentence. The meaning of WHY is for what cause, reason, or purpose. Introducing a complete question. The meaning of WHY is for what cause, reason, or purpose. b. yivlvczz gcvruu aevezg zsur yfzzb ozpx kpy fmomc vpbnj uagpw