Definition of when adverb from the Oxford Advanced American Dictionary

      

    when

     adverb
    adverb
    NAmE//wɛn//
     
    , NAmE//wən//
     
     
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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. 2used 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 Florida was in May, when the weather was beautiful.
See the Oxford Advanced Learner's Dictionary entry: when