English version

which

From Longman Dictionary of Contemporary Englishwhichwhich /wɪtʃ/ ●●● S1 W1 determiner, pronoun  1 CHOOSEused to ask or talk about one or more members of a group of people or things, when you are uncertain about it or about them Which book are you looking for? Which are the most important crops? Miranda was sure it was one of them, but was not sure which.which of I don’t know which of us was the more scared.2 DETAILused after a noun to show what thing or things you mean Did you see the letter which came today? Now they were driving by the houses which Andy had described.3 INFORMATIONused, after a comma in writing, to add more information about the thing, situation, or event you have just mentioned The house, which was completed in 1856, was famous for its huge marble staircase. One of the boys kept laughing, which annoyed Jane intensely. He was educated at the local grammar school, after which he went on to Cambridge. She may have missed the train, in which case (=if this has happened) she won’t arrive for another hour.4 don’t know/can’t tell etc which is which
Examples from the Corpus
in which caseSome students may be creating a videotaped drama, in which case numbers and technicians must be calculated and provided.By combining drying with the use of a disinfectant impregnated cloth in which case the final rinse is also omitted.It may show there has been no irregularity or malpractice, in which case the process ends.We may have to cut it off, in which case, what about this - drapes across as you had them!
Which?Which? /wɪtʃ/ trademark  a British magazine that tests products made by different companies and provides reports on them to help people decide which one to buy. Which? is known for providing useful information that can be trusted. There is a similar magazine in the US called Consumer Reports.
Pictures of the day
Do you know what each of these is called?
Click on the pictures to check.
Word of the day luck out to be lucky