From the base of dokeo; a law (civil, ceremonial or ecclesiastical) -- decree, ordinance.
see GREEK dokeo
1. of public decrees (as τῆς πόλεως, Plato, legg. 1, p. 644 d.; of the Roman Senate (Polybius 6, 13, 2); Herodian, 7, 10, 8 (5, Bekker edition)): of rulers, Luke 2:1; Acts 17:7; Hebrews 11:23 Lachmann (Theod. in Daniel 2:13; Daniel 3:10; Daniel 4:3; Daniel 6:13, etc. — where the Sept. uses other words).
2. of the rules and requirements of the law of Moses, 3Macc. 1:3; διατήρησις τῶν ἁγίων δογμάτων, Philo, alleg. legg. i., § 16; carrying a suggestion of severity, and of threatened punishment, τόν νόμον τῶν ἐντολῶν ἐν δογμασι, the law containing precepts in the form of decrees (A. V. the law of commandments contained in ordinances), Ephesians 2:15; τό καθ' ἡμῶν χειρόγραφον τοῖς δογμασι equivalent to τό τοῖς δογμασι (dative of instrument) by ὄν καθ' ἡμῶν, the bond against us by its decrees, Colossians 2:14; cf. Winers Grammar, § 31, 10 Note 1 (Buttmann, 92 (80); on both passages see Lightfoot on Colossians, the passage cited).
3. of certain decrees of the apostles relative to right living: Acts 16:4. (Of all the precepts of the Christian religion: βεβαιωθῆναι ἐν τοῖς δόγμασιν τοῦ κυρίου καί τῶν ἀποστόλων, Ignatius ad Magnes. 13, 1 [ET]; of the precepts (`sentences' or tenets) of philosophers, in the later secular writings: Cicero, acad. 2, 9, 27de suis decretis, quae philosophi vocant dogmata.) (On the use of the word in general, see Lightfoot as above; (cf. 'Teaching' etc. 11, 3 [ET]).)