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emperor (n.)

early 13c., from Old French empereor "emperor, leader, ruler" (11c.; accusative; nominative emperere; Modern French empereur), from Latin imperatorem (nominative imperator) "commander, emperor," from past participle stem of imperare "to command" (see empire).

Originally a title conferred by vote of the Roman army on a successful general, later by the Senate on Julius and Augustus Caesar and adopted by their successors except Tiberius and Claudius. In the Middle Ages, applied to rulers of China, Japan, etc.; non-historical European application in English had been only to the Holy Roman Emperors (who in German documents are called kaiser), from late 13c., until in 1804 Napoleon took the title "Emperor of the French."

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Definitions of emperor from WordNet

emperor (n.)
the male ruler of an empire;
emperor (n.)
red table grape of California;
emperor (n.)
large moth of temperate forests of Eurasia having heavily scaled transparent wings;
Synonyms: emperor moth / Saturnia pavonia
emperor (n.)
large richly colored butterfly;
Synonyms: emperor butterfly
From wordnet.princeton.edu