counterpart
From LSJ
Ἀναβάντα γὰρ εἰς τὴν ἀκρόπολιν, καὶ διὰ τὴν ὑπερβολὴν τῆς λύπης προσκόψαντα τῷ ζῆν, ἑαυτὸν κατακρημνίσαι → For he ascended the acropolis and then, because he was disgusted with life by reason of his excessive grief, cast himself down the height
English > Greek (Woodhouse)
substantive
P., use adj., ἀντίστροφος.
music was a counterpart of gymnastic: P. ἦν (μουσική) ἀντίστροφος τῆς γυμναστικῆς (Plato, Republic 522A).