“System of government” in Japanese
Short answer
System of government in Japanese is “政体” (seitai). Full meaning: form of government, system of government, polity.
Other ways to say “System of government” in Japanese
統治機構
touchikikou system of government, government structure
支配体制
shihaitaisei system of government
政體
seitai form of government, system of government, polity
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