"dictatorship" in the noun sense
1. dictatorship, absolutism, authoritarianism, Caesarism, despotism, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny
a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)
Source: WordNet® (An amazing lexical database of English)
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