A person who advocates for or practices archimperialism; an advocate of supreme imperial power.
From 'archimperial' + '-ist' (one who practices or advocates). The suffix '-ist' identifies a person who follows or promotes the ideology of archimperialism.
Imagine a historical figure so devoted to empire that calling them an 'imperialist' seems insufficient—an archimperialist would be like the ultimate power-maximizer of empires, though it's mostly a theoretical term in political discourse.
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