χρώμεθα γὰρ πολιτείᾳ οὐ ζηλούσῃ τοὺς τῶν πέλας νόμους → we live under a form of government which does not emulate the institutions of our neighbours
neuter of αἴτιος; a reason or crime (like αἰτία): cause, fault.
αἴτιον: τό причина Plat., Dem.
cause