emperor

/ˈɛmpərər/
noun
  1. A male ruler of an empire, often with supreme authority over a large territory.
    • The emperor's decree changed the laws of the land.
    • The emperor ruled over a vast empire that spanned three continents.
    • Ancient Roman emperors were often worshipped as gods.
  2. A person who has great power or influence in a particular field.
    • She became the undisputed emperor of the chess world.
    • He was considered the emperor of the fashion industry.
    • The tech emperor built a company that changed the world.
Antonyms