Dictatorship
A system in which one person (or small group) holds absolute political power without effective legal limits or accountability to voters.
Origin
Originally a Roman office: a dictator was appointed for six months in extreme emergencies, given total authority to act, and expected to surrender it when the crisis passed (Cincinnatus famously did; Caesar did not). The modern sense — a personalist ruler who has seized and kept power — is a 20th-century specialty: Mussolini, Hitler, Stalin, Mao, Franco, dozens of Cold War strongmen across Latin America, Africa, and Asia, and a long current list (North Korea, Belarus, Eritrea, Turkmenistan). Different from authoritarianism, which is the broader category, and from totalitarianism, which goes further by trying to control every aspect of private life.
Modern usage
Almost always pejorative. 'Dictator' is the standard insult for any leader thought to be ignoring democratic norms — used loosely in democracies and accurately in actual ones. 'Banana republic' (Latin American military strongman + dependent economy) is a related cliché. The mustache-and-uniform iconography is global shorthand.
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