This is the 889th most frequent Catalan word.
quin
"Quin" means "which" or "what" in English, depending on context.
'Quin' is used as an interrogative pronoun referring to an undefined choice among a set of options.
No sé quin escollir.
I don't know which one to choose.
'Quin' is used as an interrogative adjective to inquire about a specific item among a set, modifying the noun 'llibre' (book).
Quin llibre estàs llegint?
Which book are you reading?
'Quin' is used as an exclamatory adjective to emphasize the quality of the noun 'temps' (weather).