when
adv//wɛn//när, då
(interrogative) At what time? At which time? Upon which occasion or circumstance? Used to introduce direct or indirect questions about time.
At (or as soon as) that time that; at the (or any and every) time that; if.
During the time that; at the time of the action of the following clause or participle phrase.
At what time; at which time.
(interrogative) What time; which time.