What is the definition of americorps? the definition of americorps is a voluntary civil society program supported by the U.S. federal government, foundations, corporations, and other donors engaging adults in public service work with a goal of "helping others and meeting critical needs in the community." Members commit to full-time or part-time positions offered by a network of nonprofit community organizations and public agencies, to fulfill assignments in the fields of education, public safety, health care, and environmental protection. The program is often seen as a domestic Peace Corps.