Willing
Part of speech: verb
Definition: To wish, desire.
Part of speech: adjective
Definition: Ready to do something that is not (can't be expected as) a matter of course.
Part of speech: noun
Definition: The execution of a will.
Example sentence: We must be willing to pay a price for freedom.
Volition
Part of speech: noun
Definition: A conscious choice or decision.The mental power or ability of choosing; the will.
Example sentence: Any creation of art is conceived and born under influences, amidst the atmosphere of reverie and the most customary volition of the artist. It is there, in any case, that his work arises from.