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

when

adverb
 
/wen/
 
/wen/
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  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. 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. at which time; on which occasion
    • The last time I went to Scotland was in May, when the weather was beautiful.
  4. Word OriginOld English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’.
See when in the Oxford Advanced American DictionarySee when in the Oxford Learner's Dictionary of Academic English
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