Petitio Principii
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In logic. Begging the question, which is the taking of a thing for true or for granted, and drawing conclusions from it as such, when it is really dubious, perhaps false or at least wants to be proved, before any inferences ought to be drawn from it.