Abjuration

n. denial of an oath

Abjuration is the solemn repudiation, abandonment, or renunciation by or upon oath, often the renunciation of citizenship or some other right or privilege. It comes from the Latin abjurare, "to forswear").Abjuration of the realm was a type of abjuration in ancient English law that was a renunciation of citizenship, a type of self-imposed exile. The person taking the oath swore never to return to the kingdom unless by permission. This was often taken by fugitives who had taken sanctuary: I swear on the Holy Book that I will leave the realm of England and never return without the express permission of my Lord the King or his heirs. I will hasten by the direct road to the port allotted to me and not leave the King's highway under pain of arrest or execution. I will not stay at one place more than one night and will seek diligently for a passage across the sea as soon as I arrive, delaying only one tide if possible. If I cannot secure such passage, I will walk into the sea up to my knees every day as a token of my desire to cross. And if I fail in all this, then peril shall be my lot.
See more at Wikipedia.org...

Noun
1. a disavowal or taking back of a previous assertion
(synonym) retraction, recantation
(hypernym) disavowal, disclaimer
(hyponym) withdrawal, backdown, climb-down
(derivation) abjure, recant, forswear, retract, resile

n. recantation, disavowal, renunciation, act of giving up; denial, relinquishment by formal declaration

(n.)
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.
  

(n.)
A solemn recantation or renunciation; as, an abjuration of heresy.