Define why. why synonyms, why pronunciation, why translation, English dictionary definition of why. adv. For what purpose, reason, or cause; with what intention, justification, or motive: Why is the door shut?
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.
