This is the 7466th most frequent Polish word.
kornelia
"Kornelia" is a Polish feminine given name, equivalent to "Cornelia" in English.
In this sentence, 'Kornelia' is used as a proper noun, specifically a person's name.
Kornelia ma piękną sukienkę.
Kornelia has a beautiful dress.
Here, 'Kornelia' is again a proper noun, denoting the name of the person the speaker interacted with.
Wczoraj rozmawiałem z Kornelią na temat sztuki.
Yesterday, I talked with Kornelia about art.
In this sentence, 'Kornelia' is the subject of the question, functioning as a proper noun referring to an individual.