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English definition of “when”

when

conjunction     /wen/
TIME A2 used to say at what time something happened or will happen : I found it when I was cleaning out the cupboards . We'll go when you're ready .Question words and expressions
ALTHOUGH B2 although : Why are you doing this when I've asked you not to?Connecting words which express a contrast
(Definition of when conjunction from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “when” in other dictionaries

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