ἐλευθέριον

From LSJ

τούτου δὲ συμβαίνοντος ἀναγκαῖον γίγνεσθαι πάροδον καὶ τροπὰς τῶν ἐνδεδεμένων ἄστρων → but if this were so, there would have to be passings and turnings of the fixed stars

Source

Russian (Dvoretsky)

ἐλευθέριον: τό Arst., Xen. = ἐλευθεριότης.