sovereign

1. A monarch; the ruler of a country.
2. One who is not a subject to a ruler or nation.
3. A gold coin of the United Kingdom, with a nominal value of one pound sterling but in practice used as a bullion coin.
4. A very large champagne bottle with the capacity of about 25 liters, equivalent to 33⅓ standard bottles.
5. Any butterfly of the tribe Nymphalini, or genus Basilarchia, as the ursula and the viceroy.
6. A large, garish ring; a sovereign ring.

verb

To rule over as a sovereign.

1. Exercising power of rule.

   sovereign nation

2. Exceptional in quality.

   Her voice was her sovereign talent.

3. Extremely potent or effective (of a medicine, remedy etc.).
4. Having supreme, ultimate power.
5. Princely; royal.
6. Predominant; greatest; utmost; paramount.