/ ˈnekrəʊmænsi; NAmE ˈnekroʊ-/ noun [ U ]
1.
the practice of claiming to communicate by magic with the dead in order to learn about the future
2.
the use of magic powers, especially evil ones
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WORD ORIGIN
Middle English nigromancie , via Old French from medieval Latin nigromantia , changed (by association with Latin niger , nigr- black) from late Latin necromantia , from Greek (from necro- nekros corpse and -mancy manteia divination). The spelling was changed in the 16th cent. to conform with the late Latin form.