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mortal sin

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noun Roman Catholic Church.
  1. a willfully committed, serious transgression against the law of God, depriving the soul of divine grace.
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Compare venial sin.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for mortal sin

mortal sin

  1. Christianity a sin regarded as involving total loss of graceCompare venial sin
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012