- an absolute or supreme ruler.
- (in Imperial Rome) emperor.
- (in Republican Rome) a temporary title accorded a victorious general.
- (in imperial Rome) a title of the emperor
- (in republican Rome) a temporary title of honour bestowed upon a victorious general
- a less common word for emperor
“commander-in-chief,” Latin agent noun from stem of imperare “to command” (see imperative). In the Roman republic, a commander; in the Roman Empire, the emperor.