mastercode
nounUK /ˈmɑːstəkəʊd/
US /ˈmæstərkoʊd/
A mastercode is a special secret code that opens or unlocks something.
The guard typed the mastercode to open the gate.
OTHER MEANINGS
2. The main set of instructions that controls a computer program or system.
The engineer fixed the mastercode that runs the whole robot.
3. A top-level code used to organize or classify many smaller codes.
Each item in the library has its own code under the mastercode.
4. A secret sequence that lets someone change all the settings on a device.
Only the owner knows the mastercode for the alarm system.