κατήχησις

A. instruction by word of mouth: generally, instruction, Hp. Praec. 13, Cic. Att. 15.12.2, D.H. Dem. 50, Din. 7, Ath.Med. ap. Orib. inc. 21.6, S.E. M. 1.7; διὰ τὴν κ. τῶν συνόντων by communication with companions, in bad sense, Chrysipp.Stoic. 3.54, cf.55, Gal. 5.463.

II. accompaniment of the monochord by louder instruments which drown its tune, Ptol. Harm. 2.12 (pl.).