Electricity. excess voltage.
Physics. the amount by which the voltage applied to an ionization chamber exceeds the Geiger-Müller threshold.

1905–10; over- + voltage

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World English Dictionary
overvoltage (ˈəʊvəˌvəʊltɪdʒ)
a voltage above the normal level

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The intent is to limit the damage that results from an overvoltage condition to that of several blown fuses in a crate.
The overvoltage at the customer bus created by switching the capacitor can be harmful to sensitive electronics equipment.
All outputs of the power supply are protected for both overvoltage and overcurrent.
The study of hydrogen overvoltage at single crystal electrodes will be continued.
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