κατηχ-έω · katēch-eō — LSJ
sound over, through
sound over or through, ἁρμονία κ. τῆς θαλάττης Philostr. Im. 1.19, cf. 2.12.
2 sound amiss
sound amiss, opp. συνηχέω, Vitr. 5.8.1.
II teach by word of mouth, instruct, to be informed, instructed
teach by word of mouth: hence generally, instruct, κ. τινὰ πολλὰ τῶν ἀγνοουμένων Agrippa ΙΙ ap. J. Vit. 65, cf. Luc. Asin. 48, PStrassb. 41.37 (iii A.D.):—Pass., to be informed or instructed, περί τινος Act.Ap. 21.21; κ. ὅτι . . Ph. 2.575; ὥσπερ κατηχήμεθα S.E. M. 5.5.
2 instruct in the elements of religion
in NT, instruct in the elements of religion, 1 Ep.Cor. 14.19:—Pass., περὶ ὧν κατηχήθης λόγων Ev.Luc. 1.4; ὁ κατηχούμενος τὸν λόγον Ep.Gal. 6.6; κατηχημένος τὴν ὁδὸν τοῦ Κυρίου Act.Ap. 18.25, cf. Porph. Chr. 26.