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key card

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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Contemporary definitions for key card

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's 21st Century Lexicon
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