The fallacy of assuming in the premise of an argument that which one wishes to prove in the conclusion; a begging of the question.
(logic) The fallacy of assuming in the premise of an argument the conclusion which is to be proved.
Origin of petitio-principii
- Medieval Latin petītiō prīncipiī Latin petītiō request Latin prīncipiī genitive of prīncipium beginning
From American Heritage Dictionary of the English Language, 5th Edition