noun, feminine/petiˌθjon de pɾinˈθipjo/plural: peticiones de principio
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”).