This is the 95th most frequent Slovak word.
slovenska
"Slovenská" means "Slovak" in English, often referring to something or someone female or related to Slovakia.
In this sentence, 'slovenskej' (the genitive form of 'slovenská') is used as an adjective specifying that the literature discussed is Slovak in nature.
Toto je kniha slovenskej literatúry.
This is a book of Slovak literature.
Here, 'slovenskú' is the accusative singular form of the feminine adjective 'slovenská,' used to describe a specific anthem that is Slovak.
Spievame slovenskú hymnu.
We are singing the Slovak anthem.
In this sentence, 'slovenskou' is the instrumental singular form of 'slovenská,' signifying the tradition being discussed is Slovak.