SUPREM'ACY, noun [See Supreme.] State of being supreme or in the highest station of power; highest authority or power; as the supremacy of the king of Great Britain; or the supremacy of parliament.

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

Oath of supremacy in Great Britain, an oath which acknowledges the supremacy of the king in spiritual affairs, and renounces or abjures the pretended supremacy of the pope.