This is the 11144th most frequent Polish word.
gminnego
"Gminnego" means "communal" or "pertaining to a municipality" in English.
In this case, 'gminnego' describes the sports association as belonging to or organized at the municipal level.
Uczestniczyłem w spotkaniu gminnego stowarzyszenia sportowego.
I attended a meeting of the municipal sports association.
Here, 'gminnego' refers to something related to the municipality, specifically the cultural center managed at the municipal level.
Biblioteka gminnego ośrodka kultury została wyremontowana.
The library of the municipal cultural center has been renovated.
Here, 'gminnego' pertains to the office, indicating that it operates at the level of the municipality.