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.
Examples from the web for key card
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 sandwiches.
It is not clear when she left the room since key card records do not show times of exit.
At the time of the incident, the office was locked and only accessible with a key card, which key also accessed the safe.
The after hours drop box is available to admitted attorneys with a key card issued by the court.
Sometimes they would steal a key card from someone's desk, and use the key card to reenter the building over the weekend.
Both data centers have key card control limiting access to authorized staff members.
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