This is the 6048th most frequent Polish word.
agnieszka
The Polish word "Agnieszka" is a female given name equivalent to "Agnes" in English.
Here, 'Agnieszka' is used as a proper noun referring to a specific person, indicating a name. It's the subject of the sentence.
Agnieszka to moja przyjaciółka.
Agnieszka is my friend.
'Agnieszkę' is used in its accusative form, showing that the person named Agnieszka is the object of the verb 'spotkałem' (met).
Spotkałem Agnieszkę w parku.
I met Agnieszka in the park.
Here, 'Agnieszce' is in the locative case, indicating the topic of conversation in the sentence.