“Adversary,” or “Accuser.” There is a figure known as ha-satan (“the satan”) that appears in the Hebrew Bible as a heavenly prosecutor, a member of the sons of God, under YHVH, who prosecutes people in the heavenly court and tests the loyalty of YHVH's followers. We presume this is a different accuser than the malevolent entity known as Lucifer who exists in opposition to God we read about in other parts of the scriptures.
In the Book of Jubilees, YHVH grants Mastema authority over fallen angels to tempt humans to sin and then to punish them. In Zenos, Lucifer is called leviathan, the angel cast out of heaven that tries to tempt the earth.