the.com/sectarianism

means Rigid devotion to one's own sect, faction, or denomination, especially when it curdles into hostility or discrimination toward other groups within the same broader community.

from Traces back to 'sect,' from Latin 'secta' meaning a way of life, school of thought, or faction — itself from 'sequi,' to follow (the same root gives us 'sequence' and 'pursue'). So a sect was originally just a group of followers. The '-arian' piece marks a believer or adherent, and '-ism' turns belief into system. The popular folk link to 'section,' as if a sect is merely a slice cut off from the whole, is tempting but not the real root — 'secta' and 'section' (from 'secare,' to cut) are separate Latin words that only sound like cousins.