This is the 3073rd most frequent Polish word.
posiadaczy
"Posiadaczy" means "owners" or "holders" in English.
The word 'posiadaczy' here is in the genitive case, used to refer to the holders or owners of tickets, implying possession.
Posiadaczy biletów prosimy o ustawienie się w kolejce.
Ticket holders are asked to form a line.
In this sentence, 'posiadaczy' also represents the genitive plural form, indicating individuals who possess properties.
Na spotkaniu będzie lista posiadaczy nieruchomości w okolicy.
During the meeting, there will be a list of property owners in the area.
Here, 'posiadaczy' denotes the specific group that has or holds membership cards, again in a genitive plural form.