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English definition of “when”

when

conjunction, adverb [not gradable] (AT WHAT TIME)   /hwen, wen, hwən, wən/
at what time ; at the time at which: When is supper going to be ready ? When did the American Civil War begin ? I was just getting into the shower when the phone rang .
(Definition of when conjunction, adverb (AT WHAT TIME) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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