Definitions
from the GNU version of the Collaborative International Dictionary of English
 n. a unit of energy, being equal to the kinetic energy acquired by an electron when accelerated through a potential difference of one volt. It is equal to 1.602 x 1019 Joules. It is abbreviated eV.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. a unit of energy equal to the work done by an electron accelerated through a potential difference of 1 volt
Etymologies
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Examples

Neutrinos have _very small_ masses (probably a few hundredths of an electronvolt), they usually travel at nearly (but not quite) the speed of light, and they rarely interact with anything.

LHC successfully reached its goal of a 7 TeV energy level  two beams of protons each at 3.5 trillion electronvolt energies whizzed in opposite directions and eventually collided at several points in the gigantic underground ringshaped particle accelerator.

Develop 0.5 MeV [mega electronvolt] proton beams and collide onto microscale B11 target with a fusion Q (energy ratio) > 20, possibly leading to selfsustained fusion.

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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