noun (n)

• the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world(noun.cognition)

  Synonym:
  black art, black magic, sorcery
  

  source: wordnet30
• conjuring up the dead, especially for prophesying(noun.cognition)

  source: wordnet30
• The art of revealing future events by means of a pretended communication with the dead; the black art; hence, magic in general; conjuration; enchantment. See Black art.(noun)

  source: webster1913