Supremacy Su*prem"a*cy, n. [Cf. F. supr['e]matie. See {Supreme}.] The state of being supreme, or in the highest station of power; highest or supreme authority or power; as, the supremacy of a king or a parliament. [1913 Webster]

The usurped power of the pope being destroyed, the crown was restored to its supremacy over spiritual men and causes. --Blackstone. [1913 Webster]

{Oath supremacy}, an oath which acknowledges the supremacy of the sovereign in spiritual affairs, and renounced or abjures the supremacy of the pope in ecclesiastical or temporal affairs. [Eng.] --Brande & C. [1913 Webster]

The Collaborative International Dictionary of English. 2000.