συμβιωτής
From LSJ
Ὁ θάνατος οὐθὲν πρὸς ἡμᾶς, ἐπειδήπερ ὅταν μὲν ἡμεῖς ὦμεν, ὁ θάνατος οὐ πάρεστιν, ὅταν δὲ ὁ θάνατος παρῇ, τόθ' ἡμεῖς οὐκ ἐσμέν. → Death is nothing to us, since when we are, death has not come, and when death has come, we are not.
English (LSJ)
οῦ, ὁ,
A one who lives with, companion, partner, prob. l. in Eup.448, cf. Plb.8.10.3, Cic.Fam.9.10.2. II esp. of the confidants of the Roman Emperors, etc., Plu.2.207c, Jul. Caes.326b; σ. τοῦ βασιλέως Βαβυλῶνος LXX Bel 2.