This is the 13451st most frequent Polish word.
partyjne
"Partyjne" means "party-related" or "pertaining to a political party" in English.
Here, 'partyjne' is an adjective describing issues ('problemy') as related to a political party.
Zgromadzenie miało na celu omówić partyjne problemy w regionie.
The assembly aimed to discuss party-related issues in the region.
In this sentence, 'partyjne' functions as an adjective modifying 'interesy', meaning interests associated with a political party.
Partyjne interesy często wpływają na decyzje władz.
Party interests often influence governmental decisions.
This use of 'partyjne' modifies 'hasła', indicating that the slogans are tied to a political party.