"Sorcery" is defined by Dave Hunt / T.A. McMahon in The Seduction of Christianity as "any attempt to manipulate reality (internal, external, past, present, or future) by various mind-over-matter techniques that run the gamut from alchemy and astrology to positive/possibility thinking."
A standard dictionary definition is: "Use of supernatural power over others through the assistance of spirits; witchcraft." (Middle English sorcerie, from Old French, sorcier, sorcerer).