This is the 4888th most frequent Polish word.
papierowe
"Papierowe" means "paper" or "made of paper" in English.
'Papierowe' modifies 'zaproszenie' (invitation), emphasizing its physical form as made of paper, rather than electronic.
Otrzymałem papierowe zaproszenie na ślub.
I received a paper invitation to the wedding.
Here, 'papierowe' is an adjective describing 'talerzyki' (plates), indicating they are made of paper.
Mam papierowe talerzyki na piknik.
I have paper plates for the picnic.
In this context, 'papierowe' describes 'samoloty' (airplanes) to specify they are crafted from paper.