This is the 639th most frequent Polish word.
powiatu
"Powiatu" means "county" or "district" in English, referring to an administrative region in Poland.
Here, "powiatu" is in the genitive case, showing possession or association with "starosta", indicating 'governor of the district'.
Starosta powiatu ogłosił nowe zasady.
The district governor announced new rules.
In this sentence, "powiatu" is used in the genitive case to describe the boundaries belonging to or associated with 'the district'.
Granice powiatu były wyznaczone przez rzekę.
The boundaries of the district were defined by the river.
Here, "powiatu" is also in the genitive case, describing the forest as belonging to or associated with 'the district'.