This is the 963rd most frequent Lithuanian word.
kokią
The word "kokią" in Lithuanian means "what" or "which" (feminine, accusative case).
Here, 'kokią' is the accusative singular feminine form of 'koks,' used as an interrogative adjective modifying the noun 'knygą' (book).
Kokią knygą tu skaitei vakar?
What book did you read yesterday?
In this sentence, 'kokią' is the accusative singular feminine form of 'koks,' functioning to ask about the specifications of the noun 'dovaną' (gift).
Ji nežinojo, kokią dovaną pasirinkti jam gimtadieniui.
She didn't know what gift to choose for his birthday.
Here, 'kokią' is used in a dependent clause as a question word relating to 'spalvą' (color) in the accusative singular feminine form.