Abjuration

Ab·ju·ra·tion

Abjuration

n.
  1. The act of abjuring or forswearing; a renunciation upon oath; as, abjuration of the realm, a sworn banishment, an oath taken to leave the country and never to return.
  2. A solemn recantation or renunciation; as, an abjuration of heresy.

Phrases & Compounds
Oath of abjuration
an oath asserting the right of the present royal family to the crown of England, and expressly abjuring allegiance to the descendants of the Pretender.