| 1. | a period of the French Revolution, from about March, 1793, to July, 1794, during which many persons were ruthlessly executed by the ruling faction. |
| 2. | (lowercase ) any period or situation of ruthless administration or oppression. |
A phase of the French Revolution aimed at destroying all alleged pockets of resistance to the revolution. Robespierre was a leader of the Terror, during which thousands were sent to the guillotine.