the.com/volunteerism

means The practice of offering your time and labor to a cause without pay, usually out of goodwill, duty, or social expectation.

from Built from 'volunteer,' which comes from the French 'volontaire,' rooted in Latin 'voluntarius' — 'of one's free will,' from 'voluntas,' meaning will or wish. The word entered English first in a military sense, for soldiers who enlisted by choice rather than conscription, then widened over the 1800s to cover any unpaid, willing service. The '-ism' tacked on later turns the individual act into a whole ethic or movement — the idea, not just the deed.