This is the 6813th most frequent French word.
laquelle
"Which one" or "which."
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.
Je te donne ce livre, lequel tu as demandé.
I am giving you this book, which you requested.
Indicates the relative pronoun representing 'which' referring to 'la maison'.