This is the 13542nd most frequent Polish word.
pierwszemu
The Polish word "pierwszemu" is the dative form of "pierwszy," meaning "to the first" or "for the first (one)."
In this sentence, "pierwszemu" is used in the dative case to indicate to whom the gratitude is directed, showing possession or relationship with "uczniowi".
Dziękuję pierwszemu uczniowi za pomoc.
I thank the first student for the help.
"Pierwszemu" in this context is used in the dative case to denote the recipient of congratulations, connected to the concept of "miejsce" (place).
Gratulacje należą się pierwszemu miejscu.
Congratulations belong to the first place.
Here, "pierwszemu" is used in the dative case, and it relates to "spotkaniu" (meeting), indicating the indirect object in the context of memory.