\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.
      The usurped power of the pope being destroyed, the
      crown was restored to its supremacy over spiritual men
      and causes.                              --Blackstone.
{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.