Definition of diallelus in US English:

diallelus

noun

Logic
  • 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.

Origin

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.

Pronunciation

diallelus

/ˌdʌɪəˈliːləs/