Defintion of Magic per apostle Bruce R. McConkie:
"In imitation of true religion with its miracles, signs, and gifts of the Spirit, Satan has substitute rituals and practices called magic. Attempts by unauthorized and therefore powerless ministers to duplicate the miraculous wonders of true religion result in the degenerate worship of magic. In its nature magic is the art which produces effects by the assistance of supernatural beings or by a mastery of secret forces in nature; magicians (those skilled in magic) are necromancers, sorcerers, conjurers, and the like.
Magic has flourished among apostate peoples in all ages. The magicians of Pharaoh's court had power given them from Satan to duplicate many of the miracles wrought by Moses" (McConkie 1966, 462).