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?

“I don’t know what happened to her. That’s why I’m asking you. You were supposed to protect her. Now tell me where she is!”

Feb 2, 2026 · Adverb why (not comparable) (interrogative) For what cause, reason, or purpose. Introducing a complete question.

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

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.

why: For what purpose, reason, or cause; with what intention, justification, or motive.

WHY definition: for what? for what reason, cause, or purpose?. See examples of why used in a sentence.