One of the mysteries of the English language finally explained.
Circular reasoning; the attempt to establish a conclusion by means of a proposition which is itself dependent on the conclusion which the arguer is attempting to prove; an instance of this.
Late 17th century; earliest use found in Ralph Cudworth (1617–1688), philosopher and theologian. From post-classical Latin diallelus (in diallelus modus) from Hellenistic Greek διάλληλος (in τρόπος διάλληλος reasoning in a circle) from ancient Greek δι' ἀλλήλων through or by means of one another.
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