noun A resource or argument, used to achieve a purpose.
The government played the Orange card to get support for their Ireland policy.
noun Any flat, normally rectangular piece of stiff paper, plastic, etc.
noun A bank card.
noun Any electronic payment (rather than a cash payment using notes, bills or coins).
Cashier: "Cash or card? Customer: "I'm paying on my phone, so card."
noun Paper that is thicker and more durable than normal writing or printing paper, but thinner and more flexible than paperboard, used for postcards, playing cards, etc.; card stock.