ναί,
adverb, used to express strong affirmation, yea, verily, in [[ 8th c.BC: Homerus Epicus mostly followed by δή, ν. δὴ ταῦτά γε πάντα.. κατὰ μοῖραν ἔειπες 8th c.BC: Ilias Homerus Epicus “Illiad” 1.286, +others; ν. μήν 5th c.BC: Empedocles Poeta Philosophus 76.2; ν. μάν 3rd c.BC: Theocritus Poeta Bucolicus 27.27; ν. μέν 3rd c.BC: Apollonius Rhodius Epicus 2.151; ν. μέντοι 2nd c.AD: Lucianus Sophista “Astr.” 14: used alone, σὲ κρίνω, ν. σέ] Refs 8th c.BC+] yea thee, [[ 5th c.BC: Sophocles Tragicus “Electra” 1445; ἀποκρίνασθαι ν. ἢ οὔ 4th c.BC: Aristoteles Philosophus “Topica” 158a16, etc.; τὸ ε ¯ οὐκ ἔστι χαρακτηριστικὸν.., τὸ δὲ ᾱ ναί 4th-5th c.AD: Choeroboscus Grammaticus “Scholia in Theodosii Canones” 2.85. ] Refs 5th c.BC+]
__2 frequently in oaths, ν. μά yea by.., see at {μ; ν}. alone, ν. τὰν Κόραν [[ 5th-6th c.BC: Aristophanes Comicus “Vespae” 1438, compare 5th c.BC: Euripides Tragicus “Bacchae” 534 (Lyric poetry); ν. τὸν Ποτιδᾶν 5th c.BC: Epicharmus Comicus 81; ν. τὼ σιώ 5th-6th c.BC: Xenophon Historicus “Historia Graeca (Hellenica)” 4.4.10 ] Refs 5th c.BC+]; ν. πρὸς θεῶν ἀρήξατ᾽ [[ 5th c.BC: Euripides Tragicus “Medea” 1277. ] Refs 5th c.BC+]
__II in answers, yes, τοῦτ᾽ ἐτήτυμο; Answ. ν. [[ 4th-5th c.BC: Aeschylus Tragicus “Persae” 738 (troch.), compare 5th c.BC: Sophocles Tragicus “Electra” 845 (Lyric poetry), 5th-6th c.BC: Plato Philosophus “Theaetetus” 193a, “Grg.” 448b, etc.; doubled, 5th-6th c.BC: Aristophanes Comicus “Nubes” 1468, 3rd c.BC: Callimachus Epicus “Fragmenta” 1.56 P., NT.Matt.5.37. ] NT+5th c.BC+]
__II.2 ν. followed by ἀλλά, etc., to mark a qualified assent, yes, but.., [[ 4th c.BC: Aeschines Orator 3.84 ] Refs 4th c.BC+]; ν., κατὰ σχολήν γε ἴσως· οὐ μήν.. [[ 5th-6th c.BC: Plato Philosophus “Sophista” 226e, compare “R.” 415e. ] Refs 5th c.BC+]