A person or entity that establishes or exercises hegemony; one who seeks to dominate politically or culturally.
From Greek *hegemon* (leader) plus *-ize* (to make or practice) plus *-er* (one who). The agent noun describes an active practitioner of hegemonic control.
The rise of 'hegemonizer' as a term shows how academics and critics needed a word for actors who actively construct dominance—it's not just being dominant, but actively working to make one group's power seem inevitable.
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