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key card

noun
1.
a plastic card, similar to a credit card, containing data on an embedded magnetized strip that can electronically unlock a door, activate a machine, etc.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for key-card
noun

a magnetically encoded plastic card that can be used as a key in a door or to operate some other electronic device, such as an ATM; also called card key , also written keycard

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