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