constitutionalism-a constitutional system of government (usually with a written constitution). republic, democracy, commonwealth-a political system in which the supreme power lies in a body of citizens who can elect people to represent them. diarchy, dyarchy-a form of government having two joint rulers.echnocracy-a form of government in which scientists and technical experts are in control; technocracy was described as that society in which those who govern justify themselves by appeal to technical experts who justify themselves by appeal to scientific forms of knowledge.