This is the 7881st most frequent Russian word.
каролийна
"Каролийна" is not a standard Russian word; it appears to be a name, "Karolina," typically transliterated as "Carolina" in English.
'Каролийна' in genitive case indicates possession, showing that the house belongs to Karolina.
Дом Каролийны находится в центре города.
Karolina's house is located in the city center.
Here, 'Каролийна' is used as a proper noun, serving as a personal name in the sentence.
Каролийна гуляет в парке.
Karolina is walking in the park.
'Каролийна' is the direct object of the verb 'встретил', used in an accusative case in Russian.