This is the 6813th most frequent French word.
laquelle
"Which one" or "which."
Indicates the relative pronoun representing 'which' referring to 'la maison'.
C'est la maison dans laquelle j'habite.
This is the house in which I live.
Introduces a direct question by specifying 'which one'. Refers to a selection among options.
Laquelle de ces options préfères-tu?
Which of these options do you prefer?
Acts as a relative pronoun 'which' connecting 'le livre' to the additional relative clause.