petitio principii
拉丁语，源自 petitio “请愿”（见 petition（n.））和 principium 的属格（见 principle（n.））。它翻译为希腊语 to en arkhē aiteisthai “在开始时假设”。
In logic, the assumption of that which in the beginning was set forth to be proved; begging the question: a fallacy or fault of reasoning belonging to argumentations whose conclusions really follow from their premises, either necessarily or with the degree of probability pretended, the fault consisting in the assumption of a premise which no person holding the antagonistic views will admit. [Century Dictionary]
在逻辑学中，假设最初被证明是正确的； 即“假设问题”：一种归属于论证的谬误或推理错误，其结论确实从其前提中得出，无论是必然的还是所声称的概率，错误在于假设一个前提，持有对立观点的人不会接受。[世纪词典]