This is the 9163rd most frequent Polish word.
szwajcarii
"Switzerland" (genitive form in Polish).
In this sentence, "Szwajcarii" is in the locative case, expressing the location where someone resides.
Mieszkam w Szwajcarii od kilku lat.
I have been living in Switzerland for a few years.
Here, "Szwajcarii" is in the genitive case, denoting possession or association with Switzerland.
Przedstawiciele Szwajcarii przybyli na konferencję.
The representatives of Switzerland arrived at the conference.
In this sentence, "Szwajcarii" is in the dative case, indicating the direction towards which the action is directed.