voltage deviation
the difference, generally expressed as a percentage, between the voltage at a given instant at a point in the system, and a reference voltage such as nominal voltage, a mean value of the operating voltage, declared supply voltage
GRM: n.
Note: at a point in the electrical system
References:
SEE cut-in voltage
SEE nominal voltage
SEE operating voltage
SEE rated voltage
SEE supply voltage
SEE tripping voltage
SEE voltage stability
SEE working voltage

ENERGY TERM COURTESY OF ENERGY.EU