| Noun | 1. | tyrant - a cruel and oppressive dictatorczar - a person having great power | |
| 2. | tyrant - in ancient Greece, a ruler who had seized power without legal right to itswayer, ruler - a person who rules or commands; "swayer of the universe" | |
| 3. | tyrant - any person who exercises power in a cruel way; "his father was a tyrant" | |