Meaning of “card” - Learner’s Dictionary

card

noun uk us /kɑːd/
MESSAGE [ C ]

A2 a folded piece of stiff paper with a picture on the front and a message inside that you send to someone on a special occasion:

a birthday card
INFORMATION [ C ]

B1 a piece of stiff paper or plastic that has information printed on it:

a library card
This phone accepts coins and cards.
GAME [ C ] (also playing card)

A2 one of a set of 52 pieces of stiff paper with numbers and pictures used for playing games:

UK/US a pack of cards/ US a deck of cards
We spent the evening playing cards (= playing games using cards).
PAPER [ U ] UK
WITHOUT ENVELOPE [ C ]

a postcard (= card with a picture on one side that you send without an envelope)

COMPUTER [ C ]

B1 a part inside a computer that controls how the computer operates:

→ See also cash card , charge card , Christmas card , credit card , debit card , phone card , smart card , swipe card , trump card , wild card , be on the cards , put/lay your cards on the table

(Definition of “card” from the Cambridge Learner’s Dictionary © Cambridge University Press)