/ Dictionary / Index O overvoltage: Meaning and Definition of Find definitions for: o•ver•volt•age Pronunciation: (ō'vur-vōl"tij), [key] — n. excess voltage. 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. overview overwatch Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language