Definitions for "Master keyed"
adj. 1. of or pertaining to a cylinder or group of cylinders which are or are to be combinated so that all may be operated by their own change key(s) and by additional key(s) known as master key(s) 2. a warded lock whose warding has been designed to allow different hierarchies of keys to operate
A lock or latch capable of being operated also by a Master Key as well as its own change or servant key.
or (MK): When all lock can be locked or unlocked with one key. Similar to keyed alike but in a master key system, all locks may be keyed differently but the master key will override the regular user key. In this way one key can open all locks and the locks may be all keyed differently. Useful for office buildings.