Etymology

emperorism

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Today it means: The form of government in Japan prior to WWII, with the emperor as head of state. Full definition →

Japanese 天皇制
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The story

  1. Japanese · calque of天皇制“emperor system”
  2. English todayemperorism

From emperor + -ism, possibly a calque of Japanese 天皇制 (tennō-sei, “emperor system”) or 天皇主義 (tennō shugi, “emperor doctrine”).

Etymology from Wiktionary, CC BY-SA 4.0.