petitio principii

[pi-tish-ee-oh prin-sip-ee-ahy; Lat. pe-tee-ti-oh pring-kip-i-ee]

pe·ti·ti·o prin·ci·pi·i

[pi-tish-ee-oh prin-sip-ee-ahy; Lat. pe-tee-ti-oh pring-kip-i-ee]
noun Logic.
a fallacy in reasoning resulting from the assumption of that which in the beginning was set forth to be proved; begging the question.

Origin:
1525–35; < Medieval Latin petītiō prīncipiī, translation of Greek tò en archêi aiteîsthai the assumption at the outset
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Petitio principii has a plethora of syllables.
So is supercalifragilisticexpialidocious. Does it mean:
(used as a nonsense word by children to express approval or to represent the longest word in English.)
given to using long words.
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World English Dictionary
petitio principii (pɪˈtɪʃɪˌəʊ prɪnˈkɪpɪˌaɪ)
 
n
logic Sometimes shortened to: petitio a form of fallacious reasoning in which the conclusion has been assumed in the premises; begging the question
 
[C16: Latin, translation of Greek to en arkhei aiteisthai an assumption at the beginning]

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