WordNet sense 1 (mentally disposed):

ready

WordNet sense 2 (eagerly disposed to act or to be of service):

happy

WordNet sense 3 (having made preparations):

disposed, prepared, inclined

WordNet sense 4 (having given consent):

consenting

WordNet sense 5 (not brought about by coercion or force):

unforced, uncoerced

WordNet sense 6 (of your own free will or design; not forced or compelled):

voluntary

WordNet sense 7 (the act of making a choice):

volition