1. An electrode that derives its potential to unit charges of a reversible nature, in contrast to electrodes used in electroplating and destroyed during their use.
2. An electrode; such as, the silver/silver chloride electrode in which the electrochemical reaction is reversible, which results in a low resistance to direct current.

An electrode reaction is considered reversible in the "electrochemical sense" if the reaction is fast, that is, if the exchange current density of the electrode reaction is large.

In contrast, in the "chemical sense", reversibility indicates that the reaction can proceed both in forward and backward (reverse) directions.