One that exercises supreme, permanent authority, especially in a nation or other governmental unit, as: A king, queen, or other noble person who serves as chief of state; a ruler or monarch. A national governing council or committee. A nation that governs territory outside its borders. A gold coin formerly used in Great Britain. Self-governing; independent: a sovereign state. Having supreme rank or power: a sovereign prince. Paramount; supreme: Her sovereign virtue is compassion. Of superlative strength or efficacy: a sovereign remedy. Unmitigated: sovereign contempt.