sovereign

Put simply, your sovereign is your king or queen. George III was the sovereign of Great Britain and her colonies — including the American ones. At least he was until a little thing called the Revolutionary War upset everything.

Sovereign as an adjective can be used to indicate the ultimate power of a state, whether a monarchy or not, as in "Peru exercised its sovereign rights to all minerals within its borders." A sovereign is also a British gold coin with a face value of one pound sterling (with the monarch's face on it). But don't sell it for a pound, because it's worth its weight in gold — quite literally — which is a lot more than a pound is worth.

Definitions of sovereign
  1. noun
    a nation's ruler or head of state usually by hereditary right
    synonyms: crowned head, monarch
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    types:
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    Capetian
    a member of the Capetian dynasty
    Carlovingian, Carolingian
    a member of the Carolingian dynasty
    czar, tsar, tzar
    a male monarch or emperor (especially of Russia prior to 1917)
    emperor
    the male ruler of an empire
    Rex, king, male monarch
    a male sovereign; ruler of a kingdom
    Merovingian
    a member of the Merovingian dynasty
    Shah, Shah of Iran, shah
    title for the former hereditary monarch of Iran
    empress
    a woman emperor or the wife of an emperor
    Holy Roman Emperor
    sovereign of the Holy Roman Empire
    Kaiser, kaiser
    the title of the Holy Roman Emperors or the emperors of Austria or of Germany until 1918
    King of England, King of Great Britain
    the sovereign ruler of England
    King of France
    the sovereign ruler of France
    King of the Germans
    the sovereign ruler of the Germans
    mikado, tenno
    the emperor of Japan; when regarded as a religious leader the emperor is called tenno
    Emperor of Rome, Roman Emperor
    sovereign of the Roman Empire
    Romanoff, Romanov
    a member of the imperial family that ruled Russia
    type of:
    chief of state, head of state
    the chief public representative of a country who may also be the head of government
    ruler, swayer
    a person who rules or commands
  2. adjective
    (of political bodies) not controlled by outside forces
    “a sovereign state”
    synonyms: autonomous, independent, self-governing
    free
    able to act at will; not hampered; not under compulsion or restraint
  3. adjective
    greatest in status or authority or power
    synonyms: supreme
    dominant
    exercising influence or control
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