1) Alacrity 2) Receptiveness 3) Receptivity 1) Being happy to do something 2) Cheerful compliance 3) Disposition 4) Eagerness 5) Gameness 6) Heart 7) Inclination 8) Keenness 9) Readiness 10) State of volunteers 11) Temperament 12) Voluntariness 13) Willing mind 
• (n.) The quality or state of being willing; free choice or consent of the will; freedom from reluctance; readiness of the mind to do or forbear.
Will'ing·ness noun The quality or state of being willing; free choice or consent of the will; freedom from reluctance; readiness of the mind to do or forbear. « Sweet is the love which comes with willingness .» Dryden. 
[n] - cheerful compliance
noun cheerful compliance; `he expressed his willingness to help`