ἰσορρόπησις
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
English (LSJ)
εως, ἡ,
A equipoise, equilibrium, Hero Spir.1.1.
Greek (Liddell-Scott)
ἰσορρόπησις: -εως, ἡ, = τῷ ἑπομ., Ἥρων ἐν Ἀρχ. Μαθηματ. σελ. 153.