ab·volt (?b?v?lt?)n. The centimeter-gram-second electromagnetic unit of potential difference, equal to one hundred-millionth of a volt.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.abvolt (?æb?v??lt) n (Units) the cgs unit of potential difference in the electromagnetic system; the potential difference between two points when work of 1 erg must be done to transfer 1 abcoulomb of charge from one point to the other: equivalent to 10?8 voltCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014