overvoltage noun 2verb 1forms 3 noun2 •The hazardous condition that occurs when the voltage in a circuit is raised above that for which it was designed. •The difference between the electric potential of an electrode or cell under the passage of a current and the thermodynamic value of the electrode or cell potential in the absence of electrolysis. verb1 •To raise the voltage of a circuit beyond that for which it was designed. formsovervoltaged · overvoltaging · overvoltages