noun
A political system in which one person holds unlimited power. Used in political science and historical contexts.
その国は長年オートクラシーによって支配されてきた。
That country has been ruled by an autocracy for many years.
独裁 is the native Japanese term for dictatorship or autocracy, more common in everyday political discussion. オートクラシー is a technical loanword used mainly in academic or comparative politics contexts.
Borrowed from English 'autocracy', ultimately from Greek 'autokratēs' (self-ruling).