a plastic card with magnetically encoded data that is decoded when passed through a slotted electronic reader, especially for payment or identification purposes.
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British Dictionary definitions for swipe card
a credit card, identity card, etc, with a magnetic strip that holds encoded information that can be electronically interpreted as it is passed through the slot of a machine designed to read it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012