ἰαῖ
From LSJ
πολλῶν ὁ καιρὸς γίγνεται διδάσκαλος → the critical moment will turn out to be the teacher of many things
French (Bailly abrégé)
interj.
ah ! cri de joie ou de douleur.
Russian (Dvoretsky)
ἰαῖ: interj. ах!
1) возглас скорби Soph.;
2) возглас радости Arph.