potential difference

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The difference in electric potential between two points, especially two points in an electric circuit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the difference in potential energy between two points in an electric field; the difference in charge between two points in an electrical circuit; voltage

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the difference in electrical charge between two points in a circuit expressed in volts