1. a plastic card with a magnetic strip or electronic chip used to unlock doors or gain access to buildings

Examples

• I forgot my keycard and couldn’t get into the office building.
• The hotel room keycard stopped working after I put it near my phone.
• Employees must scan their keycards to enter the secure area.
• She swiped her keycard at the dormitory entrance.
• The keycard system tracks when people enter and leave the building.
• My keycard gives me access to the gym and parking garage.