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when (EN)
adverb, conjunction, interjection

adverb “when”

when (more/most)
  1. used to ask about the specific time or occasion something happens
    When do you plan to start your new job?
  2. in a situation or condition in which (something applies)
    "Happiness is when what you think, what you say, and what you do are in harmony." – Mahatma Gandhi

conjunction “when”

when
  1. as soon as
    Call me when you get home so I know you've arrived safely.
  2. during the time that
    I love listening to music when I'm working out at the gym.
  3. specifies the exact time something happens
    Let's meet up on Wednesday, when I'll be in your neighborhood.
  4. considering that
    Why buy a new car when the one you have still runs perfectly well?
  5. whereas
    You say you want to lose weight, when in fact you keep skipping the gym.

interjection “when”

when
  1. a way to tell someone to stop or that there is enough of something
    A: "I'll pour you some juice, say when." B: "When!"