Autocracy

[Sarah]

The action of the vital principle, or of the instinctivepowers, toward the preservation of the individual; also, the vitalprinciple. [In this sense, written also autocrasy.] Dunglison.

[Sarah]

A political theory favoring unlimited authority by a single individual.

[Mark Zuckerberg]

a [system of government] by one person with [absolute] [power].

[Hina Muqadas]

government by a single person or small group that has unlimited power or authority, or the power or authority of such a person or group