Webster's English Dictionary

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emperor

em.per.or \'em-p*r-*r, -pr*r\ n [ME, fr. OF empereor, fr. L imperator, 
   lit., commander, fr. impe]ratus, pp. of imperare to command, fr. in- + 
   parare to prepare, order - more at PARE : the sovereign or supreme monarch 
   of an empire