The ideology, practice, or doctrine of factionists; an extreme form of factionalism emphasizing factional identity and interests above all else.
From factionist + -ism (suffix forming ideologies). A rare, specialized term suggesting an organized ideological commitment to factional division.
This almost unpronounceable word shows how English stacks suffixes — it's technically correct but so unwieldy that nobody really uses it, preferring 'extreme factionalism' instead.
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