An Etymological Dictionary of Astronomy and Astrophysics

The removal or transference of an electric charge, as by the conversion of chemical energy to electrical energy.
The sudden and momentary equalization of a difference of potential, as between two terminals.

Etymology (EN): From M.E. deschargen, from O.Fr. deschargier “unload,” from L.L. discarricare, from → dis- “do the opposite of” + carricare “to load a cart,” from carrus “cart.”

Etymology (PE): Vâbâr, from vâ- reversal prefix, → de- + bâr→ charge.