This is the 3890th most frequent Polish word.
rejonowego
"Rejonowego" means "district" or "regional" (adjective form).
Here, 'rejonowego' is used as an adjective in the genitive case, modifying 'sąd' (court), to indicate that it pertains to a district jurisdiction.
Sąd rejonowy znajduje się w centrum miasta.
The district court is located in the city center.
Here, 'rejonowego' is used as an adjectival noun, referring to an official position within a district.
Spotkanie z radnym rejonowym odbędzie się w czwartek.
The meeting with the district councilman will take place on Thursday.
Here, 'rejonowego' modifies 'planu' (plan), indicating the plan is for a specific district area, showing its attributive quality.