This is the 622nd most frequent Polish word.
europejskich
The word "europejskich" in English means "European" (genitive or locative plural form).
In this sentence, 'europejskich' is an adjective in the genitive plural form, describing the noun 'krajów' (countries) by indicating their origin as European.
Projekt ten jest wspierany przez fundusze europejskich krajów.
This project is supported by the funds from European countries.
Here, 'europejskich' modifies the plural noun 'kompozytorów' (composers) in the genitive case, expressing their cultural association with Europe.
Muzyka europejskich kompozytorów ma bogatą historię.
The music of European composers has a rich history.
In this example, 'europejskich' serves as an adjective describing 'tradycji' (traditions) in the genitive plural, signifying their European origin.