This is the 3959th most frequent Polish word.
tadeusz
The Polish word "Tadeusz" is a male given name, equivalent to "Thaddeus" in English.
Here, 'Tadeusz' is used as a proper noun and refers to a specific person's name.
Tadeusz jest moim przyjacielem.
Tadeusz is my friend.
In this sentence, 'Tadeusz' is part of the title of a literary work, representing the character from the story.
Czytałem książkę pt. "Pan Tadeusz".
I read a book titled "Pan Tadeusz."
Here, 'Tadeusz' is used as a proper noun in the dative case ('Tadeuszowi') to indicate the recipient of an action.