1. imperator - Noun
2. Imperator - Proper noun
A commander; a leader; an emperor; -- originally an appellation of honor by which Roman soldiers saluted their general after an important victory. Subsequently the title was conferred as a recognition of great military achievements by the senate, whence it carried wiht it some special privileges. After the downfall of the Republic it was assumed by Augustus and his successors, and came to have the meaning now attached to the word emperor.
Source: Webster's dictionaryAlfonso took Castile for himself and Garcia recovered his kingdom of Portugal and Galicia, but in 1073 the Alfonso VI gathered all power and started to style himself as Imperator totius Hispaniæ (Emperor of All Hispania) since 1077. Source: Internet
Augustus also styled himself as Imperator Caesar divi filius, "Commander Caesar son of the deified one". Source: Internet
Augustus (Imperator Caesar Divi Filius Augustus), as Caesar's adopted son and heir, discarded the family name of his natural father and initially renamed himself "Gaius Julius Caesar" after his adoptive father. Source: Internet
He was, for example, given the title of "Father of the Fatherland" and " imperator ". Source: Internet
He was then escorted to the Praetorian camp, where, after a few moments of surprise and indecision, he was saluted as Imperator. Source: Internet
He adopted the title Imperator totius Hispaniae ("Emperor of all Hispania ", referring to all the Christian kingdoms of the Iberian Peninsula, and not just the modern country of Spain). Source: Internet