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definitions
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argumentum ad hominem

noun logic
  1. fallacious argument that attacks not an opponent's beliefs but his motives or character
  2. argument that shows an opponent's statement to be inconsistent with his other beliefs
  3. an instance of either of these
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Word Origin

literally: argument to the person
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