petitio principii
a fallacy in reasoning resulting from the assumption of that which in the beginning was set forth to be proved; begging the question.
Origin of petitio principii
1Words Nearby petitio principii
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How to use petitio principii in a sentence
Is it not then a petitio principii to say, that the fact ought to be disbelieved because the induction opposed to it is complete?
A System of Logic: Ratiocinative and Inductive | John Stuart MillThe following are additional instances of petitio principii, under more or less of disguise.
A System of Logic: Ratiocinative and Inductive | John Stuart MillBut if the words are cited as the proof, it would be a clear petitio principii, though there had been nothing else against it.
Aids to Reflection | Samuel Taylor ColeridgeFor if not, it is merely a petitio principii, and a somewhat wide one.
Arrows of the Chace, v. 2 | John RuskinAnd then the declivity is slippery and at each instant there is risk of a fall into petitio principii.
British Dictionary definitions for petitio principii
/ (pɪˈtɪʃɪˌəʊ prɪnˈkɪpɪˌaɪ) /
logic a form of fallacious reasoning in which the conclusion has been assumed in the premises; begging the question: Sometimes shortened to: petitio
Origin of petitio principii
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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