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. 2014.
Cite This Source Link To key card's 21st Century Lexicon
Main Entry:  key card
Part of Speech:  n
Definition:  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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Example sentences
Safety precautions include around-the-clock security monitoring and key
  card-activated elevators.
Customers use their smartphone or key card to unlock the car.
We've covered key card hotel locks over seafood, in-room credit card safes over
It is not clear when she left the room since key card records do not show times
  of exit.
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