a mystery, secret, of which initiation is necessary; in the NT: the counsels of God, once hidden but now revealed in the Gospel or some fact thereof; the Christian revelation generally; particular truths or details of the Christian revelation.
Strong's:
μυστήριον
a secret or "mystery" (through the idea of silence imposed by initiation into religious rites) Derivation: from a derivative of μύω (to shut the mouth);
KJV Usage: mystery.
TBESG:
μυστήριον
mystery
G:N-N
μυστήρισν, -ου, τό (< μυέω), [in LXX: Dan LXX TH Dan.2:18 ff. (רָז), Refs Tob.12:7, 11, Jdth.2:2, Wis.2:22 6:22 14:15, 23, Sir.3:18 22:22 27:16-17, 21, 2Ma.13:21 * ;] __1. that which is known to the μύστης (initiated), a mystery or secret doctrine, mostly in pl., τὰ μ. (Æsch., Hdt., al.). __2. 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, Jth, 2Mac, ll, with). __3. In NT, of the counsels of God (cf. Th.: Refs Job.15:8, Psa.25:14 for סוֹד), once hidden but now revealed in the Gospel or some fact thereof; __(a) of the Christian revelation generally : Refs Rom.16:25, 1Co.2:7, Col.1:26-27, Eph.3:3, 9; τ. βασιλείας τ. θεοῦ, Mrk.4:11; τ. θεοῦ, Refs 1Co.2:1, Rev.10:7; τ. θ., Χριστοῦ, Col.2:2; τ. Χριστοῦ., Refs Col.4:3, Eph.3:4; τ. θελήματος αὐτοῦ, Eph.1:9; τ. εὐαγγελίον, Eph.6:19; τ. πίστεως, 1Ti.3:9; τ. εὐσεβείας, 1Ti.3:16; __(b) of particular truths, or details, of the Christian revelation : Refs Rom.11:25, 1Co.15:51, Eph.5:32, 2Th.2:7, Rev.1:20 17:5, 7; pl., τὰ μ., Refs 1Co.13:2 14:2; θεοῦ, 1Co.4:1; τ. βασιλείας τ. οὐρανῶν (θεοῦ), Refs Mat.13:11, Luk.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.).† (AS)
Thayer:
1) hidden thing, secret, mystery 1a) generally mysteries, religious secrets, confided only to the initiated and not to ordinary mortals 1b) a hidden or secret thing, not obvious to the understanding 1c) a hidden purpose or counsel 1c1) secret will 1c1a) of men 1c1b) of God: the secret counsels which govern God in dealing with the righteous, which are hidden from ungodly and wicked men but plain to the godly 2) in rabbinic writings, it denotes the mystic or hidden sense 2a) of an OT saying 2b) of an image or form seen in a vision 2c) of a dream
μυστήριον
mustērion
moos-tay'-ree-on
From a derivative of μύω muō (to shut the mouth); a secret or “mystery” (through the idea of silence imposed by initiation into religious rites)
G2576 καμμύωκαμμύω
kammuō
kam-moo'-o
For a compound of G2596 and the base of G3466; to shutdown, that is, close the eyes
KJV Usage: close.
G3453 μυέωμυέω
mueō
moo-eh'-o
From the base of G3466; to initiate, that is, (by implication) to teach
KJV Usage: instruct.
G3467 μυωπάζωμυωπάζω
muōpazō
moo-ope-ad'-zo
From a compound of the base of G3466 and ωψ ōps (the face : from G3700); to shut the eyes, that is, blink (seeindistinctly)
KJV Usage: cannot see afar off.
G3474 μωρόςμωρός
mōros
mo-ros'
Probably form the base of G3466; dull or stupid (as if shut up), that is, heedless, (morally) blockhead, (apparently) absurd