This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Done of one's own accord; voluntary.

n. Alternative spelling of free will.

n. See free will, under will.

Made, performed, or done freely or of one's own motion or accord; voluntary.

Of or pertaining to the metaphysical doctrine of the freedom of the will: as, the freewill controversy. See will.

adj. done of your own accord

"I think people understand the issue pretty well, since what they mean when they talk about intelligence and freewill is human-like intelligence and freewill, and all of us have an intimate, empirical idea about what that means even if they might not be able to articulate it to your satisfaction."

freewill   

voluntary    spontaneous