space charge definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Electronics the negative electric charge within a cloud of electrons that is located in one of the spaces between electrodes, usually the cathode and first grid, in a vacuum tube
space charge definition by American Heritage Dictionary
The excess of electrons or ions in a given volume.