europejskiej

Europejskiej is not a standalone noun in Polish. It is the feminine singular genitive form of the adjective europejski, meaning European. It can also appear in the dative and locative cases, continuing to agree with feminine nouns in those roles. In nominative form the corresponding adjective is europejska.

In practice, Europejskiej surfaces whenever a feminine noun is in a non-nominative case. For example, kultury europejskiej means “of European culture” (genitive singular). Unii Europejskiej uses the same form in the second word, as Europejska is part of the proper name Unia Europejska and its genitive Unii Europejskiej. The adjective declines like other Polish -ski adjectives: feminine nominative europejska, feminine genitive/dative/locative europejskiej, feminine instrumental europejską, and so on.

Etymologically, europejski is formed from Europe (the continent) with the common Polish adjectival suffix -ski, indicating relation or belonging. The form Europejskiej inherits this meaning and is used wherever a feminine noun requires a matching, case-appropriate descriptor.

Usage notes: Because Polish adjectives agree with both gender and grammatical case, Europejskiej will appear frequently in formal and written Polish, especially in discussions of European affairs, culture, law, or institutions when referring to a feminine noun in a non-nominative context. It is one of several inflected forms of europejski that readers encounter in standard Polish grammar.

Overall, Europejskiej is a routine, grammatically required form rather than a distinct concept or title, serving as the case-specific feminine modifier of the word European.