This is the 2479th most frequent Polish word.
gliwicach
"Gliwicach" is the locative form of "Gliwice," meaning "in Gliwice," a city in Poland.
Here, 'Gliwicach' is used in the locative case to indicate the location (Gliwice) where the action 'being' occurred.
Byłem kiedyś w Gliwicach na wakacjach.
I was in Gliwice once during my vacation.
In this instance, 'Gliwicach' is again in the locative case, used after the preposition 'in' to describe where the radio station is located.
W Gliwicach znajduje się znana radiostacja.
In Gliwice, there is a well-known radio station.
Here, 'Gliwicach' is locative as well, describing the place where an action (working) takes place.