the male sovereign or supreme ruler of an empire: the emperors of Rome.
Chiefly British. a size of drawing or writing paper, 48 × 72 inches (122 × 183 cm).

1175–1225; Middle English empero(u)r < Anglo-French; Old French empereor < Latin imperātor orig., one who gives orders, ruler, equivalent to imperā(re) to order, command (im- im-1 + -perāre, combining form of parāre to provide, prepare) + -tor -tor

emperorship, noun
preemperor, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
emperor (ˈɛmpərə)
1.  a monarch who rules or reigns over an empire
2.  See also giant peacock moth Also called: emperor moth any of several large saturniid moths with eyelike markings on each wing, esp Saturnia pavonia of Europe
3.  See purple emperor
[C13: from Old French empereor, from Latin imperātor commander-in-chief, from imperāre to command, from im- + parāre to make ready]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 13c., from O.Fr. empereor (acc.), from L. imperiatorem (nom. imperiator) "commander, emperor," from 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.; only non-historical European application in Eng. was of the Holy Roman Emperors (who in Ger. documents are called kaiser), from late 13c., until in 1804 Napoleon took the title "Emperor of the French." Empress is attested from mid-12c.; Queen Victoria in 1876 became "Empress of India."
Online Etymology Dictionary, © 2010 Douglas Harper
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