From didasko; instruction (the act or the matter) -- doctrine, hath been taught.
see GREEK didasko
1. teaching, viz. that which is taught: Mark 1:27; John 7:16; Acts 17:19; Rom. ( 2. (the act of) teaching, instruction, (cf. διδασκαλία (on the supposed distinction between the two words and their use in the N. T. see Ellicott on 2 Timothy 4:2; they are associated in 2 Timothy 4:2, 3; Titus 1:9)): Acts 2:42; 2 Timothy 4:2; ἐν τῇ διδαχή, while he was teaching, a phrase by which the Evangelist indicates that he is about to cite some of the many words which Jesus spoke at that time, Mark 4:2; Mark 12:38; τοῦ κατά τήν διδαχήν πιστοῦ λόγου, the faithful word which is in accordance with the received (2 Timothy 3:14) instruction, Titus 1:9; in particular, the teaching of the διδάσκαλος (which see 6) in the religious assemblies of Christians: λαλεῖν ἐν διδαχή, to speak in the way of teaching, in distinction from other modes of speaking in public, 1 Corinthians 14:6; ἔχω διδαχήν, to have something to teach, 1 Corinthians 14:26.