This is the 15212th most frequent Polish word.
serbskiej
"Serbskiej" means "Serbian" (adjective, feminine singular or plural, genitive case in Polish).
The word "serbskiej" is used here as an adjective to describe the village. It modifies the noun "wioski" to signify the village is Serbian.
Kultura serbskiej wioski jest bardzo interesująca.
The culture of the Serbian village is very interesting.
The word "serbskiej" functions here as an adjective defining the type of tradition related to Serbia, modifying the noun "tradycji."
Odwiedziliśmy świątynię serbskiej tradycji.
We visited the temple of Serbian tradition.
In this sentence, "serbskiej" is employed as an adjective to specify the art's nationality or cultural origin (Serbian). It modifies the noun "sztuki."