pronoun / determiner
which
WICH/wɪtʃ/
What one or ones from a particular set.
Which of these three keys fits the open padlock?
Etymology
Old English hwilc expressed “of what form.” That question about character or kind underlies asking which particular member of a set is meant.
More examples
- I cannot decide which to choose.
- The book, which I borrowed, is excellent.
- Which of these keys fits?
Forms
which