when Definition in Cambridge British English Dictionary
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Definition of "when" - British English Dictionary

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whenadverb, conjunction

uk   us   /wen/
A1 at what time; at the time at which: "I did tell you about it." "When? I don't remember." When are you going? When's the baby due? We'll go when you're ready. Tell me when to start. Ask him when he's next coming home. When do you expect to have the project completed (by)? She was only 20 when she had her first baby. He was quite shocked when I told him. I hate it when there's no one in the office. I went there when I was a child. I was just getting into the bath when the phone rang.
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Grammar

whenpronoun

uk   us   /wen/

whenconjunction

uk   us   /wen/

when conjunction (CONSIDERING THAT)

B2 considering the fact that: How can you say you don't like something when you've never even tried it! You can't complain of being lonely when you don't make any effort to meet people. Why is she training to be a teacher when she doesn't even like children? I don't suppose I can really call myself a vegetarian when I eat fish.
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when conjunction (ALTHOUGH)

B2 despite the fact that: He says he hasn't got any money when in fact he's got thousands of dollars in his account. I don't understand how he can say that everything's fine when it's so obvious that it's not.
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Translations of “when”
in Arabic مَتى…
in Korean 언제…
in Malaysian sedangkan…
in French alors que…
in Turkish ne zaman…
in Italian quando…
in Chinese (Traditional) 甚麼時候,何時…
in Russian когда?…
in Polish kiedy…
in Vietnamese mặc dù…
in Spanish si…
in Portuguese quando…
in Thai แม้ว่า…
in German wenn…
in Catalan quan…
in Japanese いつ…
in Indonesian padahal…
in Chinese (Simplified) 什么时候,何时…
(Definition of when from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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