κατηχ-έω,
sound over or through, ἁρμονία κ. τῆς θαλάττης [[ 2nd-3rd c.AD: Philostratus Sophista “Philostrati majoris imagines” 1.19, compare 2.12. ] Refs 2nd c.AD+]
__2 sound amiss, opposed to συνηχέω, [[ 1st c.BC: Vitruvius Scriptor de Architectura Latinus 5.8.1. ] Refs 1st c.BC+]
__II teach by word of mouth: hence generally, instruct, κ. τινὰ πολλὰ τῶν ἀγνοουμένων Agrippa 11 cited in [[ 1st c.AD: Josephus Historicus “Vita” 65, compare 2nd c.AD: Lucianus Sophista “Asin.” 48, “PStrassb.” 41.37 (3rd c.AD)] Refs 1st c.AD+]:—passive, to be informed or instructed, περί τινος [[ NT.Act.21.21 ] NT]; κ. ὅτι.. [[ 1st c.AD: Philo Judaeus 2.575; ὥσπερ κατηχήμεθα 2nd c.AD: Sextus Empiricus Philosophus “adversus Mathematicos” 5.5. ] Refs 1st c.AD+]
__II.2 in NT, instruct in the elements of religion, [[ NT.1Cor.14.19 ] NT]:—passive, περὶ ὧν κατηχήθης λόγων [[ NT.Luke.1.4; ὁ κατηχούμενος τὸν λόγον NT.Gal.6.6; κατηχημένος τὴν ὁδὸν τοῦ Κυρίου NT.Act.18.25, compare 3rd c.AD: Porphyrius Tyrius Philosophus “adversus Christianos - Abh. Berl. Akad.” 26. ] NT+3rd c.AD+]