The beliefs, practices, or movement of those who dissent, especially religious dissenters who refuse to accept official church doctrines.
From dissenter plus the suffix -ism. A historical term particularly applied to English Protestantism and the rejection of Anglican authority.
'Dissenterism' gave us the English Nonconformists and eventually Baptists and Congregationalists—their insistence on disagreeing with church authority created religious freedom!
Complete word intelligence in one call. Free tier — 50 lookups/day.