τᾶν

English (LSJ)

indecl., only Att. and in phrase ὦ τᾶν, as a form of address,

   A sir, my good friend, S.OT1145, Ph.1387, E.Ba.802, Pl.Ap.25c, Ep. 319e, D.1.26: freq. in Com. (not in Ar.), Pl.Com. 17 D., Men.Sam. 202, Com.Adesp.21.11 D.: with a pr. n., ὦ τ. Φαίδιμε ib.22.66 D.; used in addressing several persons, τί δρῶμεν, ὦ τᾶν; S.Ichn.98; ἆρά γε, ὦ τᾶν, ἐθελήσετε; Cratin.360, cf. Nicopho 29. (A.D.Adv. 159.11 says ωταν has a long final syllable and two accents: after criticizing earlier theories he derives it from ὦ Ετᾶν, in which Ετᾶν is a form of ἔτης, comparing μεγιστᾶν, ξυνᾶν: accented ὦ τᾶν in S.Ichn. l.c.)

Greek (Liddell-Scott)

τᾶν: κατ’ Ἀττ. κρᾶσιν ἀντί τοι ἄν· ἀλλὰ τἀν, ἀντὶ τὰ ἐν.