Definition: (noun) A form of government in which all power is vested in a single ruler or other authority.
Synonyms: dictatorship, monocracy, one-man rule, totalitarianism, tyranny, authoritarianism, despotism.
Usage: Sir Robert Walpole, ruling the country with unscrupulous absolutism, had now put an end to the employment of literary men in public life.
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Source: The Free Dictionary