This is the 2903rd most frequent Polish word.
ministrem
"Ministrem" in Polish means "minister" (a government official or clergy member) in the instrumental case.
In this sentence, 'ministrem' is an instrumental case of the noun 'minister', used to indicate his profession.
Mój ojciec jest ministrem edukacji.
My father is the minister of education.
Here, 'ministrem' is used again in the instrumental case, describing interaction with the individual holding the ministerial position.
Rozmawiałem z ministrem obrony na konferencji.
I spoke with the minister of defense at the conference.
In this example, 'ministrem' identifies the companion of the speaker during the travel, again demonstrating the instrumental case.