Where does “κριτήριο” come from?

κριτήριο (Greek) comes from Ancient Greek κριτήριον, from Ancient Greek κριτής, from Ancient Greek κρίνω, from Proto-Hellenic kríňňō, from Proto-Indo-European krinyéti, from Proto-Indo-European krey- — to sift, separate, divide.

κριτήριο (Greek): criterion