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Why (adv.) For what cause, reason, or purpose; on what account; wherefore; -- used interrogatively. See the Note under What, pron., 1.
Why (adv.) For which; on account of which; -- used relatively.
Why (adv.) The reason or cause for which; that on account of which; on what account; as, I know not why he left town so suddenly; -- used as a compound relative.
Why (n.) A young heifer.