volunteerism definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the theory or practice of being a volunteer or of using volunteers, as, without pay, in social agencies, charitable organizations, etc.
volunteerism definition by American Heritage Dictionary
Use of or reliance on volunteers, especially to perform social or educational work in communities.