Multiple systems, organizations, or structures that are explicitly designed to oppose or function without traditional hierarchical authority arrangements.
From anti- (against) + hierarchies (plural of hierarchy). The plural form 'hierarchies' comes from the singular 'hierarchy,' with 'antihierarchies' representing the opposing concept multiplied.
Antihierarchies exist everywhere you'd least expect them—Wikipedia, open-source software communities, and some intentional communes all experiment with different ways to make decisions without traditional bosses.
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