Reference > Brewer’s Dictionary > Petitio Princip’ii (A).

 Petit Serjeantry.Petitioners and Abhorrers. 
E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Petitio Princip’ii (A).
A begging of the question, or assuming in the premises the question you undertake to prove. Thus, if a person undertook to prove the infallibility of the pope, and were to take for his premises—(1) Jesus Christ promised to keep the apostles and their successors in all the truth; (2) the popes are the regular successors of the apostles, and therefore the popes are infallible—it would be a vicious syllogism from a petitio principii.   1

 Petit Serjeantry.Petitioners and Abhorrers. 


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