Any of various systems of units for electricity and magnetism based on a system of equations in which the permeability of free space is taken as unity and by means of which the abampere is defined as the fundamental unit of current.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.