διάλληλος
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
English (LSJ)
ον,
A reciprocating, λόγος Stoic. 2.90; interchangeable, of the order of words, A.D.Adv.126.2; confused, of argument, Id.Pron.50.20; διάλληλος τρόπος argument in a circle, S.E.P.1.117, 2.68; δ. δεῖξις Dam.Pr.290. II interrelated, interdependent, Plot.6.8.14.
German (Pape)
[Seite 587] τρόπος, der Cirkel im Schluß, oft Sext. Emp.; vgl. B. A. 535. 27.