Definition of "when"
- adverb
Used to introduce questions about time.
Used to introduce indirect questions about time.
- conjunction
At what time.
At such time as.
As soon as.
At a time in the past,.
- pronoun
What time; which time.
- noun
The time.
- interjection
That's enough, a command to stop adding something, especially an ingredient of food or drink.
- Sources