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1. At what time?
   "When are you coming home?"
    
2. As soon as
   "I'll get some food when I'm hungry"
    
3. In what situation
   "close the door when you're finished""

1. At the same time that
   "they were walking home when they were discussing the problem"
   - as, while, whilst [Brit]
    
2. Every time that
   "when I call you are always engaged"
   - if, whenever

Sounds like: wen

Encyclopedia: When