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1: voluntary choice or decision <I do this of my own free will>
2: freedom of humans to make choices that are not determined by prior causes or by divine intervention
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1. The ability or discretion to choose; free choice: chose to remain behind of my own free will.
2. The power of making free choices that are unconstrained by external circumstances or by an agency such as fate or divine will.
1. (Philosophy)
a. the apparent human ability to make choices that are not externally determined
b. the doctrine that such human freedom of choice is not illusory Compare determinism
c. (as modifier) a free-will decision
2. the ability to make a choice without coercion he left of his own free will: I did not influence him
So when I asked you to think of a city, and you chose Tokyo, out of the thousands of cities across the world, what made you choose that city instead of another one? The answer is that 'you don't know.'
You can't account for the choice which was made between all the different cities you know of, and the one that you ended up choosing. Thus, you don't actually have free will. Even in situations where you are given many choices and the parameters to make the most ideal choice, you can't account for the one you actually make.