a usually rectangular piece of stiff paper, thin pasteboard, or plastic for various uses, as to write information on or printed as a means of identifying the holder: a 3″ × 5″ file card; a membership card.
2.
one of a set of thin pieces of cardboard with spots, figures, etc., used in playing various games; playing card.
3.
cards, (usually used with a singular verb)
a.
a game or games played with such a set.
b.
the playing of such a game: to win at cards.
c.
Casino. the winning of 27 cards or more.
d.
Whist. tricks won in excess of six.
4.
Also called greeting card.a piece of paper or thin cardboard, usually folded, printed with a message of holiday greeting, congratulations, or other sentiment, often with an illustration or decorations, for mailing to a person on an appropriate occasion.
5.
something useful in attaining an objective, as a course of action or position of strength, comparable to a high card held in a game: If negotiation fails, we still have another card to play.
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