adj. Highest in authority; holding the highest place in authority, government, or power. Highest; greatest; most excellent or most extreme; utmost; greatest possible (sometimes in a bad sense); as, supreme love; supreme glory; supreme magnanimity; supreme folly. (Bot.) Situated at the highest part or point. The Supreme, the Almighty; God. That which is superior to all other things; as the supreme power of the state, which is an authority over all others. The Supreme Court, which is superior to all other courts.