One of the most difficult definitions perhaps on the Universe. It goes something like the work done by the (variable with distance force of the field to the charge) when it is moved from a point A to infinity devided by the charge. A can be any point in space even the terminal of a battery. It can be a point in space inside an electron tube. It can be a point anywhere in the universe.
See: Berkeley Physics Course - Purcell - Harvard University
See also: Feynman Lectures in Physics - Feynman, Leyton, Sands (there is an electric field of 100V per meter above the earth's surface. But as soon as we are there our body changes the electric lines of force as we are grounded. A high impedance field. At a few kilometers above earth the voltage is really large. Hence we have thunders ie big sparks).
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