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

      

    when

     adverb
    adverb
    BrE BrE//wen//
     
    ; NAmE NAmE//wen//
     
     
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  1. 1  (used in questions) at what time; on what occasion When did you last see him? When can I see you? When (= in what circumstances) would such a solution be possible?
  2. 2  used after an expression of time to mean ‘at which’ or ‘on which’ Sunday is the only day when I can relax. There are times when I wonder why I do this job.
  3. 3  at which time; on which occasion The last time I went to Scotland was in May, when the weather was beautiful.
  4. Word Origin Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’.
See the Oxford Advanced American Dictionary entry: when