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In Church law, the formal renunciation of apostasy, heresy, or schism. While still in effect in exceptional cases, persons now entering the Catholic Church are not required to abjure their former doctrinal errors. Their positive profession of the Catholic faith implies their abjuration of whatever they may have once held contrary to this faith. (Etym. Latin abiuratio, a foreswearing, abjuration; from ab, from iurare, to swear: abiurare, to swear away from, to deny on oath.)
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.