Vine's Expository Dictionary of NT Words 
"to be superior, to excel," is translated "supreme" in 1—Peter 2:13 : see Excel , No. 3.
King James Dictionary 
SUPRE'ME, a. L. supremus, from supra.
1. Highest in authority holding the highest place in government or power. In the United States, the congress is supreme in regulating commerce and in making war and peace. The parliament of Great Britain is supreme in legislation but the king is supreme in the administration of the government. In the universe, God only is the supreme ruler and judge. His commands are supreme, and binding on all his creatures. 2. Highest, greatest or most excellent as supreme love supreme glory supreme degree. 3. It is sometimes used in a bad sense as supreme folly or baseness, folly or baseness carried to the utmost extent. A bad use of the word.
Webster's Dictionary 
(1): ( a.) Highest; greatest; most excellent or most extreme; utmost; greatist possible (sometimes in a bad sense); as, supreme love; supreme glory; supreme magnanimity; supreme folly.
(2): ( a.) Highest in authority; holding the highest place in authority, government, or power.
(3): ( a.) Situated at the highest part or point.