Definitions from Wiktionary (when)

▸ adverb:  (interrogative) At what time? At which time? Upon which occasion or circumstance? Used to introduce direct or indirect questions about time.
▸ adverb:  (interrogative, Internet slang, often humorous) Used after a noun or noun phrase in isolation to express impatience with an anticipated future event.
▸ adverb:  At an earlier time and under different, usually less favorable, circumstances.
▸ adverb:  (relative) At which, on which, during which: often omitted or replaced with that.
▸ adverb:  (fused relative) The time at, on or during which.
▸ adverb:  (informal, in definitions or explanations) A circumstance or situation in which.
▸ noun:  The time at which something happens.
▸ Also see when

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