Quick Definition
clearness, sincerity, purity
Strong's Definition
clearness, i.e. (by implication) purity (figuratively)
Derivation: from G1506 (εἰλικρινής);
KJV Usage: sincerity
Thayer's Greek Lexicon
εἰλικρίνεια (ἐιλικρινια T (WH, see Iota; on the breathing see WH's Appendix, p. 144)), εἰλικρινείας, ἡ (εἰλικρινής, which see), purity, sincerity, ingenuousness: 1Co_5:8; 2Co_2:17; τοῦ Θεοῦ, which God effects by the Holy Spirit, 2Co_1:12 (Winers Grammar, § 36, 3 b.). (Theophrastus, Sextus Empiricus, Stobaeus)
Mounce Concise Greek Dictionary
εἰλικρίνεια eilikrineia 3x
clearness, purity; met. sincerity, integrity, ingenuousness, 1Co_5:8 ; 2Co_1:12 ; 2Co_2:17
Abbott-Smith Greek Lexicon
** εἰλικρινία
( Rec. , cl ., -κρινεία ), -ας , ἡ
( < εἰλικρινής ),
[in LXX : Wis_7:25 A * ;]
sincerity, purity: 1Co_5:8 , 2Co_1:12 ; 2Co_2:17 .†
Moulton & Milligan — Vocabulary of the Greek NT
εἰλικρίνεια [page 183]
εἰλικρίνεια or ία (WH Notes .2 p. 160 f., and for breathing ib. p. 151), not found in class. Greek, may be illustrated from P Oxy X. 1252 verso ii. 38 (A.D. 288 95) προσφεύγω ] ἐπὶ τὴν σὴν ἰλεικρινείαν , I have recourse to your probity (Edd.). The etymology is doubtful (cf. Moulton Gr. ii. § 105), but Boisacq Dict . Etym. s.v. εἰλικρινής inclines to the old derivation (rejected by LS) from εἵλη (cf. Skr. s ( ϊ ) var ) light, sun, and κρίνω , as if = examined by the light of the sun and found pure, sincere : cf. T. H. Green s definition of εἰλ . as perfect openness towards God ( Two Sermons , p. 41).
STEPBible — Tyndale Abridged Greek Lexicon
εἰλικρινία (Rec., cl., -κρινεία), -ας, ἡ
(εἰλικρινής), [in LXX: Wis.7:25 A * ;]
sincerity, purity: 1Co.5:8, 2Co.1:12 2:17.†
(AS)