petitio principii

noun
pe·​ti·​tio prin·​ci·​pii | \ pə-ˈtē-tē-ˌō-(ˌ)priŋ-ˈki-pē-ˌē How to pronounce petitio principii (audio) \

Definition of petitio principii

: a logical fallacy in which a premise is assumed to be true without warrant or in which what is to be proved is implicitly taken for granted

First Known Use of petitio principii

circa 1531, in the meaning defined above

History and Etymology for petitio principii

Medieval Latin, literally, postulation of the beginning, begging the question

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The first known use of petitio principii was circa 1531

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