Try Our Apps


The Best Internet Slang

petitio principii

[pi-tish-ee-oh prin-sip-ee-ahy; Latin pe-tee-ti-oh pring-kip-i-ee] /pɪˈtɪʃ iˌoʊ prɪnˈsɪp iˌaɪ; Latin pɛˈti tɪˌoʊ prɪŋˈkɪp ɪˌi/
noun, Logic.
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
1525-35; < Medieval Latin petītiō prīncipiī, translation of Greek tò en archêi aiteîsthai the assumption at the outset Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for petitio principii
Historical Examples
  • Note the petitio principii in the use of the word "drugged."

    Tobacco and Alcohol John Fiske
  • For if not, it is merely a petitio principii, and a somewhat wide one.

  • The like will be the case, if the petitio principii is in the minor premiss and not in the major.

    Aristotle George Grote
  • Brown saw that there would be a petitio principii if it were.

  • There is nothing in this objection also, for it rests on a petitio principii.

  • So naked and unashamed an example of petitio principii would disgrace a debater in a pinafore.

  • This chapter, in which Aristotle declares the nature of petitio principii, is obscure and difficult to follow.

    Aristotle George Grote
  • You have committed a petitio principii;12 you have assumed in your minor premiss the very point to be demonstrated.

    Aristotle George Grote
  • He admits that he cannot demonstrate the Maxim against them, and that any attempt to do this would involve petitio principii.

    Aristotle George Grote
  • Whatever we receive intuitively, we receive without proof; and stated as a naked proposition, it must involve a petitio principii.

    Short Studies on Great Subjects James Anthony Froude
British Dictionary definitions for petitio principii

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
Word Origin
C16: Latin, translation of Greek to en arkhei aiteisthai an assumption at the beginning
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
Cite This Source

Word of the Day

Difficulty index for petitio principii

Few English speakers likely know this word

Word Value for petitio

Scrabble Words With Friends

Nearby words for petitio principii