Why do they call it a master key?

Question

When the plug is turned one way, the cam pulls in on the bolt and the door can open. When the plug turns the other way, the cam releases the bolt and a spring snaps it into place so the door cannot open. The key your "super" is using is called a master key.

What's the meaning of master key?

: a key designed to open several different locks.

What makes a key a master key?

Master key system is a system that allows two or more keys to open one lock. Master keys will be able to open multiple locks. The greater the difference between the master key and the change key, the more master wafers will be needed. The more master wafers, the more possible keys can open the lock.

Can a master key open any lock?

A master key is a key capable of operating several different locks, each lock being operated by its own separate key (change key). Many people think that they have a master key because they have one key which operates many locks in their home.

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