This is the 8233rd most frequent Polish word.
osowej
"Osowej" is the locative or genitive form of "Osowa," which refers to a place name in Poland.
Here, 'osowej' functions as an adjective (genitive singular feminine case) describing the community associated with Osowa, a place name.
Spotkałem się z grupą osowej społeczności.
I met with a group from the Osowa community.
In this sentence, 'osowej' is used as an adjective (genitive singular feminine case) to describe 'ulicy', referring to a street related to Osowa.
Osowej ulicy na mapie nie znalazłem.
I couldn’t find Osowa Street on the map.
Here, 'osowej' is used as an adjective (genitive singular feminine case) describing a district associated with Osowa.