why > define

noun

• The cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores'.
  • synonyms: wherefore

• (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.
• (adv.) For which; on account of which; -- used relatively.
• (adv.) For what cause, reason or purpose; on what account; wherefore; -- used interrogatively. See the Note under What, pron., 1.
• (n.) A young heifer.