autocracy (n.) Look up autocracy at Dictionary.com
1650s, "independent power, self-sustained power," from French autocratie, from Greek autokrateia "absolute rule, rule by oneself," abstract noun from autokrates "ruling by oneself," from autos- "self" (see auto-) + kratia "rule" (see -cracy). Meaning "absolute government, supreme political power" is recorded from 1855.