The problem is that power is so easily defined to mean anything.
It could be military power: the simple ability to conquer, pillage, and kill.
It could be economic: the ability to manipulate, distribute, and withhold resources to force people to abide to your will.
It could be psychological: just creating the image of fear. Example: ever hear the "shadow government" conspiracies? If we assume, hypothetically, that it does exist, it would have gained tremendous power just through the rumor of its power, without anyone knowing what the hell it was. Oh, and as an aside: wouldn't it be awesome if a shadow world government of caring, warm-hearted Buddhist monks emerged? 
Mental: Picture this: A person imprisoned and locked in solitaire confinement. That person spends the rest of his life meditating, creating their own language, or in some other way occupying himself during imprisonment. The prison has lost its power, because it can't get into the guy's head.
Intellectual: Knowledge itself can be power just because of the fact that one has knowledge.
There's probably a billion other ways to obtain power. At that point, there's no way to measure it, so it's a completely abstract concept.
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