Note: Do not rely on this information. It is very old.
Congregationalist
Congregationalist, applied as an adjective to a body of Christian worshippers who look upon themselves as forming a community exempt from any other ecclesiastical authority than their own united opinion, and as possessing equal rights one among another. As a substantive it denotes a member of such body. Other bodies than the nominal Congregationalists hold the same democratic form of church government.