Wiktionary
n. A small card issued to and held by a member of a club, society or other organisation, verifying the member's membership for a given period.
WordNet
n. a card certifying membership in an organization
Usage examples of "membership card".
Railway season ticket, cheque book, tennis club membership card, two letters addressed to him, two photographs of Lettice and himself, driving licence, membership card for the insurance company's social club?
After Hitler came to power, everybody in Germany wanted a low number membership card in the National Socialist Party.
As far as I was concerned, she and her allies had forfeited their membership card to the humanity club when they killed Emma.
Your membership card for this place is made out for someone called Murphy.
A gun was pressed against my spine while the other two went through my papers: driving licence, membership card of the British Numismatic Association, representative's card for Mendoza S.
James showed the girl their membership card and entered the store, selecting a flatbed cart.
The company Amex, that lovely membership card for the adult sweetshop, sat snugly in his new jacket.