This is the 2752nd most frequent Catalan word.
bitllet
Ticket.
The word 'bitllet' is used here as a transportation ticket, specifically for trains, buses, or airplanes.
He comprat un bitllet per anar a Barcelona.
I bought a ticket to go to Barcelona.
The word 'bitllet' is used to refer to paper money, in this case, a euro banknote.
Aquest bitllet de cinquanta euros és nou.
This fifty-euro bill is new.
'Bitllet' is again used in the context of currency, emphasizing the need to verify its legitimacy.