Definition of "sectarianism" [sec•ta•ri•an•ism]

• Rigid adherence to a particular sect, party or denomination. (noun)

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• "The term sectarianism originated with the Protestant Reformation starting in the 1500s."
• "Then, for that vice of the mind which I call sectarianism, -- not in the religious sense of the word, but little, narrow prejudices, that make you hate your next-door neighbor because he has his eggs roasted when you have yours boiled; and gossipping and prying into people's affairs, and backbiting, and thinking heaven and earth are coming together if some broom touch a cobweb that you have let grow over the window-sill of your brains what like a large and generous, mildly aperient (I beg your pardon, my dear) course of history!"
• "First of all congratulations on doing such a great job of planting the seeds of awareness in the hearts of so many that sectarianism is self defeating."