Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun A unit of energy and work in the meterkilogramsecond system, equal to the work performed by a onekilogram force acting through a distance of one meter.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun physics a
unit ofwork , equal to that done by aforce of onekilogram acting through adistance of onemeter
Etymologies
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Examples

So, for example, a force adequate to lift one pound a distance of one foot is a footpound; that capable of lifting one kilogram a distance of one meter is a kilogrammeter, etc.

Someone can please correct me on this if I am in error, but here's what I come up with: a volt is defined as the difference in electric potential that is required to impart to 1 coulomb of electricity a kinetic energy of 1 joule = 1 newtonmeter = 1 kilogrammeter/second/second = 1 wattsecond, and since there are 6.24 x 10 to the 18th power electrons in a coulomb (according to Wikipedia, of course), this means that 1 electronvolt = 1/(6.24E18) = 1.60 times 10 to the minus 19th power wattsecond.
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