LSJ
ον, intermediate, [ψυχὴ] δεσμὸς ἔ. τυγχάνει τῶν ἄκρων Alex.Aphr. Pr. 2.67; having a mean, ἔ. ἐναντία having an intermediate term, Simp. in Cael. 340.33; ἔφη Πλάτων πάντα ἔ. Olymp. in Mete. 242.28.
inserted, μεταξυλογία ib. 41.23.
mediate, γνῶσις Eustr. in EN 331.2. Adv. -σως mediately, Them. in APo. 31.6.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
in der Mitte, dazwischen, Sp.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)