ideocracyn.
/ˌʌɪdɪˈɒkrəsi/, /ˌɪdɪˈɒkrəsi/, U.S. /ˌaɪdiˈɑkrəsi/, /ˌɪdiˈɑkrəsi/ Governance of a state according to the principles of a particular (political) ideology; a state or country governed in this way.
ΚΠ
1813 J. Adams Marginal Note 3 Mar. in Wks. (1851) VI. 403 It may be modestly suggested to the Emperor, to coin another word in his new mint, in conformity or analogy with Ideology, and call every constitution of government in France, from 1789 to 1799, an ideocracy.
1891 New Englander (New Haven, Connecticut) May 485 Making the compound state a fifth form together with monarchy, aristocracy, democracy, and ideocracy.
1940 Rev. Politics 2 29 The so-called ideocracies have disdainfully turned away from the very ideas which ought to have inspired them.
1988 Times Lit. Suppl. 1 Apr. 353/4 The Soviet Union is an ideocracy built upon a well-developed and all-embracing faith.
2003 N. S. Sheikh New Politics Islam ii. 24 The Islamic polity is an ideocracy, albeit unlike Marxism not anchored in the mechanics of the material but in a wider metaphysical political cosmology.
This is a new entry (OED Third Edition, November 2010; most recently modified version published online March 2022).
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n.1813