This is the 2514th most frequent Polish word.
marszałkowskim
"Marszałkowskim" is the locative or instrumental form of "marszałkowski," meaning "pertaining to a marshal" in Polish.
Here, 'marszałkowskim' describes the square, suggesting its attribution or dedication to a Marshal.
Marszałkowskim placem przechodzi dziś parada.
Today, a parade is passing through the Marshal Square.
In this sentence, 'marszałkowskim' is used to describe the route that is associated with a Marshal.
Idziemy na spacer Marszałkowskim Traktem.
We are going for a walk along the Marshal's Route.
Here, 'marszałkowskim' metaphorically conveys the commanding and structured nature associated with the role of a Marshal.