Official declaration by competent authority that, for lawful reasons, a previous act or contract was invalid and consequently null and void. In ecclesiastical law, annulments mainly apply to marriage contracts over which the Church has the right to determine their validity. (Etym. Latin an-, to + nullus, none; annullare, to annihilate, to annul.)
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
Why did the Archdiocese of Boston delay informing Mrs. Kennedy of Rome's overruling of her annulment for more than two years?