Usually means: Excess voltage beyond thermodynamic requirement.
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We found 7 dictionaries that define the word overpotential:

General (5 matching dictionaries)
  1. overpotential: Merriam-Webster
  2. overpotential: Wiktionary
  3. overpotential: Infoplease Dictionary
  4. overpotential: Dictionary.com
  5. Overpotential: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. overpotential: Encyclopedia

Science (1 matching dictionary)
  1. Electrochemistry Dictionary (No longer online)

Definitions from Wiktionary (overpotential)

noun:  (physics) 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

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