Wiktionary
decree absolute
n. (context legal English) the official decree marking the legal end of a marriage, allowing the two people to remarry; it follows the decree nisi after six weeks (in Britain)
Usage examples of "decree absolute".
Escape therefore, if it could be achieved, brought with it a decree absolute, total dissolution of the mistaken marriage which the prisoner had made.
The blow was like the decree absolute in a divorce: it meant that her marriage was finally, officially, definitively over, and she had no further responsibility.