A person who believes in or supports constitutionalism; someone who advocates for government limited by a constitution.
From 'constitutionalism' with the suffix '-ist' (a person who practices or believes in something). The term gained prominence during revolutions and reform movements when people fought to establish constitutional governments.
The American founding Fathers were constitutionalists fighting the idea that kings had absolute power—they believed that rules written down and agreed upon could limit even the strongest leaders!
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