Opposition to or action against factions; a group or principle that opposes the formation of competing groups or divisions.
From anti- (against) + faction (from Latin factio meaning a group united for a common purpose). Historically used to describe political movements that rejected party-based divisions.
The Founding Fathers of the United States were deeply concerned about 'factionalism' (which was the opposite of antifaction), with George Washington warning in his farewell address about the 'baneful effects of the spirit of party'—they wanted unity but ended up creating the first political party system anyway!
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