Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
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The substitution by legitimate authority of another work for the one to which a person is obligated by law or by vow. The work substituted must be better or equivalent to the original obligation, though not necessarily as difficult. (Etym. Latin commutatio, change, transformation; exchange.)