Dictionary  mag' card"Pronunciation: (mag), [key] 1. Computers.a plastic or paper card with a magnetizable layer on which data can be recorded and from which data can be read. 2. such a card used in access-control systems, as for automatically unlocking doors. Also called magnetic card. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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