World Wide Study Bible
a Bible passage
9The great dragon was thrown down, that ancient serpent, who is called the Devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him.
Devil—the Greek, for "accuser," or "slanderer."
Satan—the Hebrew for "adversary," especially in a court of justice. The twofold designation, Greek and Hebrew, marks the twofold objects of his accusations and temptations, the elect Gentiles and the elect Jews.
world—Greek, "habitable world."