Power is the ability to get others to do things for you. For instance: people go to work to earn money. Money is issued by the banks (I'm talking about national currencies: on which they charge us 10% interest). Banks also have the power to create money through the issuance of loans. Over 90% of all money in circulation within an economy was created this way. The banks: by controlling credit, control how much money is in circulation at any given time. This also gives the banks the power to control the unit worth of any currency.
At election time we - mistakenly - believe that we are voting a government 'into power'. This is an illusion. The banks have all the power. There is really no such thing as 'free markets' or 'democracy'. Politicians are just frontmen for the banks: even those that call themselves communists or socialists; look at China.
Something else that people need to understand is this: 'to have power is to exercise power'. If you do not exercise power; then you do not possess it.
Trevor Davis: I know that this doesn't really answer your question; but I still really wanted to say it anyway. Thanks for giving me the opportunity.
By the way: if your one word answer happens to be 'God' I will be extremely disappointed.