Definition of when pronoun from the Oxford Advanced Learner's Dictionary

  

when

 pronoun
pronoun
BrE BrE//wen//
 
; NAmE NAmE//wen//
 
 
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 what/which time Until when can you stay? ‘I've got a new job.’ ‘Since when?’ Word Origin Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’.
See the Oxford Advanced American Dictionary entry: when