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From The Collaborative International Dictionary of English v.0.48:
Occultism \Oc*cult"ism\, n. 1. A certain Oriental system of theosophy. --A. P. Sinnett. [1913 Webster] 2. Belief in occult powers or in supernatural forces other than the God of traditional religions, such as in magic, necromancy, alchemy, and astrology. [PJC] 3. The study and alleged use of supernatural agencies as in magic, astrology, witchcraft, alchemy, necromancy, spiritualism (communication with the dead), and fortune-telling. [PJC]