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why [ˈwaɪ]

1 why adverb
  • for what reason or purpose
  • —used to offer a suggestion or to say that a course of action is not necessary
  • —used to express irritation or annoyance

2 why conjunction
  • the cause, reason, or purpose for which
  • for which

3 why noun

4 why interjection
  • —used at the beginning of a statement especially to express surprise