Douglas Harper's Etymology Dictionary
Wiktionary
volunteerism
n. 1 (context US English) The reliance on volunteers to perform an important social or educational function. 2 The tendency to volunteer, the activity of volunteering.
Usage examples of "volunteerism".
He is more concerned about whether the spirit of volunteerism will flag when faced with personnel changes and the vagaries of funding.
Orange County that charity begins at home and that in the true spirit of volunteerism, they should use their thousand points of light to pass a county-wide tax hike to pay off their own debt.
If we cannot fill those needed positions through volunteerism, we will have no choice but to institute conscription.