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

card key

noun
 
/ˈkɑːd kiː/
 
/ˈkɑːrd kiː/
(especially North American English)
(also key card British and North American English)
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  1. a special plastic card with information recorded on it that can be read by an electronic device, which can be used instead of a door keyTopics Holidaysa2
See card key in the Oxford Advanced American Dictionary

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