This is the 16497th most frequent Polish word.
wielkopolskie
"Wielkopolskie" refers to the Greater Poland Voivodeship, a region in west-central Poland.
Here, 'wielkopolskie' functions as a proper noun, the name of a specific region.
Wielkopolskie to region w zachodniej Polsce.
Greater Poland is a region in western Poland.
In this sentence, 'wielkopolskim' is an adjective describing the voivodeship (administrative division).
Mieszkam w województwie wielkopolskim.
I live in the Greater Poland Voivodeship.
'Wielkopolskie' modifies 'traditions', acting as an adjective to specify their origin.