Quick Definition
μεγαλωσύνη, ης, ἡ n.f. majesty
Strong's Definition
from 3173; greatness, i.e. (figuratively) divinity (often God himself)
KJV Usage: majesty
UBS Dictionary of the Greek New Testament
noun, f. | -ης | μεγαλύνω
87.21 · Status · High Status or Rank [including persons of high status]
prominence, greatness, importance a state of greatness or importance
12.5{N:001} · Supernatural Beings and Powers · Supernatural Beings
the Majesty, the Majestic One (a title for God, literally: majesty) one who is characterized by majesty and greatness The use of ‘Majesty’ as a title for God may be rendered in some languages as ‘the one who is truly great’ or ‘... truly important.’ In other instances a more satisfactory equivalent is ‘the one who is truly wonderful.’
1 Items 12.4-12.8, (12.9) and 12.12 in this domain are titles for θεός[a] God (12.1). As titles, they have precisely the same reference as θεός[a], but they each contribute distinctive meanings which are legitimate qualifications of the referent in question.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
μεγαλωσύνη, -ης, 9, only in bibl. and eccl. writ. [ef W. 26,95 (90); B. 73, and see ayabwovrn |, (μέγας), Sept. for on and 77311; majesty: of the majesty of God, Heb. i. 3; viii. 1; Jude 25, (so 2 S. vii. 23; Ps. exliv. (exlv.) 3,6; Sap. xviii. 24; Sir. ii. 18, and often).
Mounce Concise Greek Dictionary
μεγαλωσύνη megalōsynē 3x
greatness, majesty, Heb. 1:3; 8:1; ascribed majesty, Jude 25*
Abbott-Smith Greek Lexicon
† μεγαλωσύνη, -ης, ἡ
(< μέγας), [in LXX chiefly for גְּדוּלָה and cogn. forms, II Ki 7:23, Ps 144 (145):3, al.;]
greatness, majesty: He 1:3 8:1, Ju 25 (elsewhere Eccl. only).†
Moulton & Milligan — Vocabulary of the Greek NT
μεγαλωσύνη. To the ordinary citations for this Biblical word we may add Aristeas 192 οὐ κατὰ τὰς ἁμαρτίας οὐδὲ τὴν peyaλωσύνην τῆς ἰσχύος τύπτοντος αὐτούς, ἀλλ᾽ ἐπιεικείᾳ χρωμένου τοῦ θεοῦ, “(οὐ does not smite them according to their sins nor according to the greatness of His might, but uses forbearance” (Thackeray). See s.v. ἀγαθωσύνη, and A. C. Pearson Verbal Scholarship, p. 18 f.
Liddell-Scott-Jones — Greek-English Lexicon
μεγαλωσύνη (megalōsunē) — majesty. μεγᾰλ-ωσύνη, ἡ, greatness, majesty, [LXX]