Wiktionary
circular argument
n. 1 (context informal English) (non-gloss A term often conflated with begging the question in philosophy. English) 2 (context philosophy logic English) An argument which commits the logical fallacy of assuming what it is attempting to prove.
Usage examples of "circular argument".
I was already used to the circular argument which is to the Athenians what the wheel of the doctrine is to Buddhists.
It's a circular argument, but in our little round human world we've managed to live on circular arguments for millennia.
Women have to climb and struggle the whole way, mostly against the circular argument that women artists are minor artists, and therefore if a painting is by a woman it is a minor painting.