This is the 8388th most frequent Polish word.
piłsudskiego
"Piłsudskiego" is the possessive form of the name "Piłsudski," referring to Józef Piłsudski, a prominent Polish statesman and military leader.
In this sentence, 'Piłsudskiego' is used in its genitive case form, referring to Józef Piłsudski, a historical figure.
Pomnik Józefa Piłsudskiego stoi w centrum miasta.
The monument of Józef Piłsudski stands in the city center.
Here, 'Piłsudskiego' is used in the street name, showing its genitive case to indicate location.
Mieszkam na ulicy Piłsudskiego.
I live on Piłsudski Street.
In this usage, the word appears in the genitive case to denote the possession or relation of the history to Piłsudski.