Why /(?)/

Why

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.
    Turn the discourse; I have a reason why I would not have you speak so tenderly.
  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.
    If her chill heart I can not move, Why, I'll enjoy the very love.
    — Cowley.
    The how and the why and the where.

Phrases & Compounds
For why
because; why. See Forwhy.

Why

n.
  1. A young heifer. [Prov. Eng.]