petición de principio

petición de principio is feminine in Spanish.

petitio principii (the logical fallacy of begging the question); petitio principii (an argument which commits such fallacy)

From Latin petītiō prīncipiī (literally “an assumption from the beginning”), calque of Ancient Greek τὸ ἐν ἀρχῇ αἰτεῖσθαι (tò en arkhēî aiteîsthai, “to assume from the beginning”).