WordWeb Online

1. Offensively self-assured or given to exercising usually unwarranted power
   "an autocratic person"; "autocratic behaviour";
   - bossy, dominating, high-and-mighty, magisterial, peremptory
    
2. Characteristic of an absolute ruler or absolute rule; having absolute sovereignty
   "autocratic government";
   - authoritarian, dictatorial, despotic, tyrannic, tyrannical

See also: domineering, undemocratic

Encyclopedia: Autocratic