petitio-principii

petitio principii

[pi-tish-ee-oh prin-sip-ee-ahy; Latin 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 (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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