Definition of petitio principii in English:

petitio principii

Syllabification: pe·ti·ti·o prin·ci·pi·i
Pronunciation: /pəˌtiSHēō prinˈsipēˌī


A fallacy in which a conclusion is taken for granted in the premises; begging the question.
More example sentences
  • This, with great respect, is a petitio principii - reasoning which assumes the very thing which requires decision.
  • Here I shall simply observe that the objection is a gross petitio principii.


Latin, literally 'laying claim to a principle'.

Definition of petitio principii in: