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

Lady Constance was in high spirits, and why not? Whether you’re a teacher or a learner, Vocabulary.com can put you or your class on the path to systematic vocabulary improvement.

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?

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