This is the 10110th most frequent Polish word.
biletem
"Biletem" means "ticket" (instrumental case) in Polish.
In this sentence, 'biletem' is used as the instrumental form of the noun 'bilet', meaning 'ticket', indicating the item held.
Mam biletem w ręku.
I have the ticket in my hand.
Here, 'biletem' is again the instrumental singular form of 'bilet', showing the means by which entry was gained.
Zdobyłem wejście na koncert dzięki biletem.
I gained entry to the concert thanks to the ticket.
In this instance, 'biletem' is used to specify the accompaniment of the journey, indicating the presence or possession of a ticket for entrance.