ναί

particle of affirmation,

yea, verily, even so; in answer to a question: Mat.9:28 13:51 17:25 21:16, Jhn.11:27 21:15-16, Act.5:8 22:27, Rom.3:29; before λέγω ὑμῖν, Mat.11:9, Luk.7:26; repeated for emphasis, ναὶ ναί (opposite to oὒ oὔ): Mat.5:37; ἤτω ὑμῶν τὸ ναὶ ναί, Jas.5:12; ν. καὶ οὔ, 2Co.1:18-19; ἵνα ᾖ . . . τὸ ναὶ ναί, 2Co.1:17; τὸ ν. 2Co.1:20; in assent to an assertion: Mat.15:27, Mrk.7:28, Rev.14:13 16:7; in confirmation of a previous assertion: Mat.11:26, Luk.10:21 11:51 12:5, Php.4:3, Phm 20; in solemn asseveration Rev.1:7 22:20.†

(AS)

yea; verily; even so