Why

Part of speech: noun (n.)

A young heifer. [Prov. Eng.] Grose.

Part of speech: adverb (adv.)

1. For what cause, reason, or purpose; on what account; wherefore; -- used interrogatively. See the Note under What, pron., 1. Turn ye, turn ye from your evil ways; for why will ye die, O house of Israel Ezek. xxxiii. 11.

2. For which; on account of which; -- used relatively. No ground of enmity between us known Why he should mean me ill or seek to harm. Milton. Turn the discourse; I have a reason why I would not have you speak so tenderly. Dryden.

3. 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.