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mortal sin

noun

Simple Definition of mortal sin

  • in the Roman Catholic Church : a sin (such as murder) that will result in punishment that lasts forever unless the person who has sinned sincerely confesses to God and asks to be forgiven

Source: Merriam-Webster's Learner's Dictionary

Full Definition of mortal sin

  1. :  a sin (as murder) that is deliberately committed and is of such serious consequence according to Thomist theology that it deprives the soul of sanctifying grace — compare venial sin 1


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