Real Dictionary

card
countable noun: A card is a piece of stiff paper or thin cardboard on which something is written or printed.

card in American English 1
a flat, stiff piece of thick paper or thin pasteboard, usually rectangular
noun: 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

card in American English 2
a wire brush for raising the nap on cloth
to use a card on (fibers) in preparation for spinning
noun: a machine for combing and paralleling fibers of cotton, flax, wool, etc., prior to spinning to remove short, undesirable fibers and produce a sliver
transitive verb: to dress (wool or the like) with a card

card in British English 1
noun: a piece of stiff paper or thin cardboard, usually rectangular, with varied uses, as for filing information in an index, bearing a written notice for display, entering scores in a game, etc

card in British English 2
noun: (formerly) a machine or comblike tool for carding fabrics or for raising the nap on cloth
verb: to comb out and clean fibres of wool or cotton before spinning

Card. in American English
abbreviation: Cardinal

Card. in British English
abbreviation for: Cardinal