This is the 7355th most frequent Polish word.
katowicki
"Katowicki" means "of or relating to Katowice," a city in Poland.
Here, 'katowickim' describes a region associated with the city Katowice, making it adjectival.
Mieszkam w katowickim rejonie.
I live in the Katowice region.
In this sentence, 'Katowickim' specifies the campus' location as pertaining to Katowice, used adjectivally.
Studiuję na Uniwersytecie Śląskim w Katowickim kampusie.
I study at the University of Silesia in the Katowice campus.
The word 'katowickiej' is employed to attribute the firm as being situated in or related to Katowice.