IMPERATOR
Etymology
Noun
imperator (plural imperators)
An emperor.
Usage notes
Frequently used in historical fiction.
Source: Wiktionary
Im`pe*ra"tor, n. Etym: [L. See Emperor.] (Rom. Antiq.)
Definition: 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 Unabridged Dictionary 1913 Edition