English

Definition of key card noun from the Oxford Advanced Learner's Dictionary

 

key card

 noun
noun
BrE BrE//ˈkiː kɑːd//
 
; NAmE NAmE//ˈkiː kɑːrd//
 
(also card key)
BrE BrE//ˈkɑːd kiː//
 
; NAmE NAmE//ˈkɑːrd kiː//
 
(especially North American English)
 
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a special plastic card with information recorded on it which can be read by an electronic device that can be used instead of a door key see also swipe card
See the Oxford Advanced American Dictionary entry: key card