This is the 28th most frequent Polish word.
która
"Która" means "which" or "that" (feminine singular).
'Która' is an interrogative pronoun used to ask about time in terms of hours.
Która godzina jest teraz?
What time is it now?
'Która' is used as an interrogative pronoun in an indirect question, asking about a specific road from a selection.
Nie wiem, która droga jest szybsza.
I don't know which road is faster.
'Która' functions as an interrogative relative pronoun introducing a relative clause.