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Meaning of overvoltage

o•ver•volt•age

Pronunciation: (ō'vur-vōl"tij), [key]
— n.
  1. excess voltage.
  2. the amount by which the voltage applied to an ionization chamber exceeds the Geiger-Müller threshold.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.