ˈemp(ə)rə(r) noun
( -s )
Etymology: Middle English emperour, from Old French empereor, from Latin imperator, from imperatus (past participle of imperare to command, from im- in- (II) + -perare, from parare to prepare, order) + -or — more at pare
1. : the sovereign or supreme monarch of an empire
George VI was the last British king to be called Emperor of India
2. obsolete : commander , imperator
3. : the largest size of handmade paper, commonly 48×72 inches
4. : emperor butterfly
5. : emperor moth