This is the 100th most frequent Slovenian word.
ljubljana
"Ljubljana" is the capital city of Slovenia.
In this sentence, 'Ljubljana' is used as a proper noun to identify the capital city of Slovenia.
Ljubljana je glavno mesto Slovenije.
Ljubljana is the capital city of Slovenia.
Here, 'Ljubljana' is used as a proper noun in an accusative case showing the direct object of the verb 'visited'.
Obiskal sem Ljubljano prejšnji vikend.
I visited Ljubljana last weekend.
In this example, 'Ljubljana' is used as a proper noun in its instrumental case to indicate comparison.