ἀντίφωνος
From LSJ
τὸ σὸν εἰς ἡμᾶς ἐνδιάθετον → your disposition towards us
English (LSJ)
ον, (φωνή)
A sounding in answer, concordant, as in the octave, ὀξύτητα βαρύτητι σύμφωνον καὶ ἀ. Pl.Lg.812d: abs., ἁρμονίαι Ph.2.485. 2 responsive to, c. gen., στεναγμάτων E.Supp.800 (lyr.). II discordant, contradictory, Plu.2.361a, Corp.Herm.16.1: c. gen., τῶν γενησομένων Plu.2.412b. III as Subst., ἀντίφωνον, τό, concord in the octave, τὸ ἀ. σύμφωνόν ἐστι διὰ πασῶν Arist. Pr.918b30, 921a8.