Quick Definition
λαμπρότης, τητος, ἡ n.f. splendor, brightness
Strong's Definition
brilliancy
Derivation: from G2986 (λαμπρός);
KJV Usage: brightness
UBS Dictionary of the Greek New Testament
noun, f. | -ητος | λάμπω
14.49 · Physical Events and States · Light
brightness, shining, radiance the state of brightness or shining In a number of languages a clear distinction is made between some object which is bright in and of itself (that is to say, the source of brightness or radiance) and objects which are bright because they reflect light from some source. In the case of MAT 17:5 (which is generally regarded as a reference to the Shekinah presence of God), the cloud would not be merely reflecting light but would be a source of light (see 14.50).
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
λαμπρότης, -ητος, 7, brightness, brilliancy: tov ἡλίου, Acts xxvi. 13. [From Hdt. (metaph.) down.]
Mounce Concise Greek Dictionary
λαμπρότης lamprotēs 1x
brightness, splendor, Acts 26:13*
Abbott-Smith Greek Lexicon
λαμπρότης, -ητος, ἡ,
[in LXX: Ps 109 (110):3 (הָדָר), al.;]
brightness, brilliancy: τ. ἡλίου, Ac 26:13.†
Moulton & Milligan — Vocabulary of the Greek NT
λαμπρότης. Like the adj., λαμπρότης is used as a title of honour, e.g. P Grenf I. 59° (v/vi A.D.) τὸ κτῆμα τῆς σῆς λαμπρότητος, BGU I. 3068 (A.D. 566) ὁμολογῶ [μεμισθῶ]σθαι παρὰ τῆς Na]prpdstytos. Cf. also OG/S 470% (time of Augustus) where a certain Theophron is described as—éy τῇ [ΑἸσίᾳ kal πρὸς τὴν πατρίδα [λ]αμπρότητα.
Liddell-Scott-Jones — Greek-English Lexicon
λαμπρότης (lamprotēs) — brightness. λαμπρότης, ητος, ἡ, brilliancy, splendour, λ. καὶ τάξις τοῦ στρατεύματος [Refs 5th c.BC+]; of a horse, [Refs]; of arms, [Refs 2nd c.BC+]
2. clearness, distinctness, [Refs 1st c.AD+]
II. metaphorically, brilliancy, splendour, [Refs 5th c.BC+]: plural, distinctions, τιμαὶ καὶ λ. [Refs]; ἔν τινος λαμπρότητι in distinction for a thing, [Refs 1st c.BC+]
II.2. munificence, [Refs 4th c.BC+]
II.3. brilliancy of style, [Refs 1st c.AD+]; λαμπρότητες τοῦ λόγου, Latin lumina orationis, [Refs 2nd c.AD+]
II.4. λ. ψυχῆς magnanimity, [Refs 2nd c.BC+]
II.5. as a title, ἡ σὴ λ. your Serenity, Serene Highness, [Refs 5th c.AD+]