- 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?
- 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 at which time; on which occasion The last time I went to Florida was in May, when the weather was beautiful.
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