ἀμφοτερότης
From LSJ
τῶν δ᾽ ὀρθουμένων σῴζει τὰ πολλὰ σώμαθ᾽ ἡ πειθαρχία → But of those who make it through, following orders is what saves most of their lives (Sophocles, Antigone 675f.)
English (LSJ)
ητος, ἡ,
A duality, etym. of Ἀμφιτρίτη, Sch.Opp.H. 1.385.