Quick Definition
ναί Disj.prt. yes, certainly, even so
Strong's Definition
a primary particle of strong affirmation; yes
KJV Usage: even so, surely, truth, verily, yea, yes
UBS Dictionary of the Greek New Testament
part.
69.1 · Affirmation, Negation · Affirmation
yes, yes it is true that, yes it is so, sure, indeed an affirmative response to questions or statements or an emphatic affirmation of a statement
MAT 5:37 · MAT 5:37 · MAT 9:28 · MAT 11:9 · MAT 11:26 · MAT 13:51 · MAT 15:27 · MAT 17:25 · MAT 21:16 · LUK 7:26 · LUK 10:21 · LUK 11:51 · LUK 12:5 · JHN 11:27 · JHN 21:15 · JHN 21:16 · ACT 5:8 · ACT 22:27 · ROM 3:29 · 2CO 1:17 · 2CO 1:17 · 2CO 1:18 · 2CO 1:19 · 2CO 1:19 · 2CO 1:20 · PHP 4:3 · PHM 1:20 · JAS 5:12 · JAS 5:12 · REV 1:7 · REV 14:13 · REV 16:7 · REV 22:20
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ναί, a particle of assertion or confirmation [akin to vn; ef. Donaldson, Cratylus § 189], fr. Hom. down, yea, verily, truly, assuredly, even so: Mt. xi. 26; Lk. x. 21; Philem. 20; Rev. i. 7; xvi. 7; xxii. 203 vai. λέγω ὑμῖν κτὰλ., Mt. xi. 9; Lk. vii. 26; xi. 51; xii. δ; vai, λέγει τὸ πνεῦμα, Rev. xiv. 13; it is responsive and confirmatory of the substance of some question or statement: Mt. ix. 28; ΧΙ, 51; xv. 27; xvii. 25; xxi. 16; Mk. vii. 28; Jn. xi. 27; xxi. 15 sq.; Acts v. 8 (9); xxii. 27; Ro. iii. 29; a repeated vai, most assuredly, [ A.V. yea, yea], expresses emphatic assertion, Mt. v. 37; ἤτω ὑμῶν τὸ ναὶ vai, let your vai be vai, i. 6. let your allegation be true, Jas. v.12 [B. 163 (142); W. 59 (58)]; εἶναι or γίνεσθαι ναὶ καὶ οὔ, to Naocdp be or show one’s self double-tongued, i. e. faithless, waver ing, false, 2 Co. i. 18 sq.; ἵνα παρ᾽ ἐμοὶ τὸ ναὶ ναὶ καὶ τὸ od ov, that with me should be found both a solemn affirmation and a most emphatic denial, i. e. that I so form my resolves as, at the dictate of pleasure or profit, not to carry them out, ibid. 17[ef. W.460 (429)]; vat ἐν αὐτῷ γέγονεν, in him what was promised has come to pass, ibid. 19; ἐπαγγελίαι ἐν αὐτῷ τὸ ναί Sc. γεγόνασιν, have been fulfilled, , have been confirmed by the event, ibid. 20 [ef. Meyer ad loe.]. It is a particle of appeal or entreaty, like the [Eng. yea] (Germ. ja): with an imperative, vai... συὰλαμβάνου αὐταῖς, Phil. iv. 3 (where Rec. has καί for vai); ναὶ ἔρχου, Rev. xxii. 20 Ree.; so vai vai, Judith ix. 12. [A classification of the uses of vai in the N. T. is given by Ellicott on Phil. iv. 3; ef. Green, ‘Crit. Note’ on Mt. i. 26.]
Mounce Concise Greek Dictionary
ναί nai 33x
a particle, used to strengthen an affirmation, certainly, Rev. 22:20; to make an affirmation, or express an assent, yea, yes, Mt. 5:37; Acts 5:8
Abbott-Smith Greek Lexicon
ναί, particle of affirmation, yea, verily, even so; in answer to a question: Mt 9:28 13:51 17:25 21:16, Jo 11:27 21:15, 16, Ac 5:8 22:27, Ro 3:29; seq. λέγω ὑμῖν, Mt 11:9, Lk 7:26; repeated for emphasis, ναὶ ναί (opp. to οὒ οὔ): Mt 5:37; ἤτω ὑμῶν τὸ ναὶ ναί, Ja 5:12; ν. καὶ οὔ, II Co 1:18, 19; ἵνα ᾖ . . . τὸ ναὶ ναί, II Co 1:17; τὸ ν., II Co 1:20; in assent to an assertion: Mt 15:27, Mk 7:28, Re 14:13 16:7; in confirmation of a previous assertion: Mt 11:26, Lk 10:21 11:51 12:5, Phl 4:3, Phm 20; in solemn asseveration: Re 1:7 22:20.†
Liddell-Scott-Jones — Greek-English Lexicon
ναί (nai) — yes. ναί, adverb, used to express strong affirmation, yea, verily, in [Refs 8th c.BC+] yea thee, [Refs 5th c.BC+]
2. frequently in oaths, ν. μά yea by.., see at {μ; ν}. alone, ν. τὰν Κόραν [Refs 5th c.BC+]; ν. πρὸς θεῶν ἀρήξατ᾽ [Refs 5th c.BC+]
II. in answers, yes, τοῦτ᾽ ἐτήτυμο; Answ. ν. [NT+5th c.BC+]
II.2. ν. followed by ἀλλά, etc., to mark a qualified assent, yes, but.., [Refs 4th c.BC+]; ν., κατὰ σχολήν γε ἴσως· οὐ μήν.. [Refs 5th c.BC+]