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καθεὶς

Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.

Greek (Liddell-Scott)

καθεὶς: (συνήθ. καθεῖς) ἀντὶ καθ’ εἷς, κατὰ εἷς, ὁ εἷς μετὰ τὸν ἄλλον, ἕκαστος, ὁ καθεὶς δὲ τῶν ἄλλων Ἑβδ. (Γ΄ Μακκ. Ε΄, 34)· οἱ δὲ ἤρξαντο λυπεῖσθαι καὶ λέγειν αὐτῷ εἷς καθεῖς (διάφ. γρ. εἷς καθ’ εἷς) Εὐαγγ. κ. Μάρκ. ιδ΄, 19, κτλ.· ἀνώμαλοςφράσις (ἀντὶ εἷς καθ’ ἕνα), πιθαν. σχηματισθὲν κατὰ τὸ οὐδέτερον ἓν καθέν, ὅπερ σημειοῦται ὁ Λουκ. ἐν Σολοικ. 9.