voltage

[vohl-tij]
noun Electricity.
electromotive force or potential difference expressed in volts.

Origin:
1885–90; volt1 + -age

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Collins
World English Dictionary
voltage (ˈvəʊltɪdʒ)
 
n
an electromotive force or potential difference expressed in volts

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

voltage
1890, from volt + -age.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

voltage volt·age (vōl'tĭj)
n.
Electromotive force or potential difference, usually expressed in volts.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
voltage   (vōl'tĭj)  Pronunciation Key 
A measure of the difference in electric potential between two points in space, a material, or an electric circuit, expressed in volts.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

voltage definition

electronics
(Or "potential difference", "electro-motive force" (EMF)) A quantity measured as a signed difference between two points in an electrical circuit which, when divided by the resistance in Ohms between those points, gives the current flowing between those points in Amperes, according to Ohm's Law. Voltage is expressed as a signed number of Volts (V). The voltage gradient in Volts per metre is proportional to the force on a charge.
Voltages are often given relative to "earth" or "ground" which is taken to be at zero Volts. A circuit's earth may or may not be electrically connected to the actual earth.
The voltage between two points is also given by the charge present between those points in Coulombs divided by the capacitance in Farads. The capacitance in turn depends on the dielectric constant of the insulators present.
Yet another law gives the voltage across a piece of circuit as its inductance in Henries multiplied by the rate of change of current flow through it in Amperes per second.
A simple analogy likens voltage to the pressure of water in a pipe. Current is likened to the amount of water (charge) flowing per unit time.
(1995-12-04)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
If there is a ripple in the voltage, the next electron in the beam has a
  different voltage.
Increasing the operating voltage will boost the energy density of the composite
  significantly.
The current that flows through a gate establishes a voltage at a particular
  point in the circuit.
If voltage wasn't enough to worry about, the world's electrical grid delivers
  current at different frequencies.
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