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why (EN)
adverb, noun, interjection

adverb “why”

why (more/most)
  1. asking for the cause, reason, or purpose of something
    Why did you decide to become a teacher?
  2. used to suggest something when not expecting a real answer
    Why don't you take a break?
  3. used in questions to suggest there is no need to do something
    Why worry about the rain when we can have fun indoors?
  4. (relative) used to talk about the reason for a statement
    He asked why she was crying.

noun “why”

Singular why, Plural whys oder onzieleg
  1. the cause, reason, or purpose of something
    She always asked the whys behind her parents' rules, wanting to understand their reasoning.

interjection “why”

why
  1. an dated way to express surprise, annoyance, or impatience
    Why, I had no idea you were coming today!