This is the 166th most frequent Polish word.
prezydenta
The Polish word "prezydenta" means "president" in English (genitive or accusative singular form).
'prezydentem' here is in the instrumental case, as it follows the preposition 'z' which typically requires this case.
Spotkałem się wczoraj z prezydentem miasta.
I met with the city's mayor yesterday.
'prezydenta' here is in the genitive case, used because it expresses possession (the president's opinion).
Nie znam opinii prezydenta na ten temat.
I do not know the president's opinion on this topic.
'prezydenta' here is in the accusative case, as it is the direct object of the verb 'wybrali' (elected).