what ismean of"in which"?
The meaning of " in which".
This is the house in which I live.
This is the school in which I learn.
This is the bed in which I sleep.
"In which" is formal English.
You can use "where" for "in which", in all these sentences.
You can use "that" instead of "in which".
The subject in which I am interested in is English.
The situation in which I find myself is very serious.
Hope this helps,