Abbott-Smith Manual Greek Lexicon
μυστήριον (G3466)
28 μυστήριον , -ου, τό ( μυέω ), [in LXX: Da LXX TH 2:18 ff. ( רָז ), To 12:7 , 11 , Jth 2:2 , Wi 2:22 6:22 14:15 , 23 , Si 3:18 22:22 27:16 , 17 , 21 , II Mac 13:21 *;] that which is known to the μύστης ( initiated ), a mystery or secret doctrine , mostly in pl., τὰ μ. (Æsch., Hdt., al.). In later writers (Menand., Incert. , 168), that which may not be revealed (not, however, as in the modern sense, intrinsically difficult to understand), a secret or mystery of any kind ( To 12:7 , 11 , Jth 2:2 , II Mac 13:21 ). In NT, of the counsels of God (cf. Th.: Jb 15:8 , Ps 24 (25):14 for סוֹד ), once hidden but now revealed in the Gospel or some fact thereof; of the Christian revelation generally: Ro 16:25 , I Co 2:7 , Col 1:26 , 27 , Eph 3:3 , 9 ; τ. βασιλείας τ. θεοῦ , Mk 4:11 ; τ. θεοῦ , I Co 2:1 , Re 10:7 ; τ. θ., Χριστοῦ , Col 2:2 ; τ. Χριστοῦ , Col 4:3 , Eph 3:4 ; τ. θελήματος αὐτοῦ , Eph 1:9 ; τ. εὐαγγελίου , Eph 6:19 ; τ. πίστεως , I Ti 3:9 ; τ. εὐσεβείας , I Ti 3:16 ; of particular truths, or details, of the Christian revelation: Ro 11:25 , I Co 15:51 , Eph 5:32 , II Th 2:7 , Re 1:20 17:5 , 7 ; pl., τὰ μ. , I Co 13:2 14:2 ; θεοῦ , I Co 4:1 ; τ. βασιλείας τ. οὐρανῶν ( θεοῦ ), Mt 13:11 , Lk 8:10 (cf. Westc., Eph. , 180 ff.; AR, Eph. , 234 ff.; Lft., Col. , 165 f.; Hatch, Essays , 57 f.; DB , iii, 465 ff.; DCG , ii, 213 ff.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain