-n(t)sē, -si noun
( -es )
Etymology: alteration (influenced by Late Latin necromantia ) of Middle English nigromancie, from Middle French nigromance, nigromancie, from Medieval Latin nigromantia, by folk etymology (influence of Latin nigr-, niger black) from Late Latin necromantia, from Late Greek nekromanteia, from Greek nekr- necr- + -manteia -mancy — more at negro
1.
a.
(1) : the art or practice of magically revealing the future, of magically influencing the course of natural events, or of magically attaining other purposes especially through communication with and the intervention of the dead
(2) : the art or practice of magically conjuring up the souls of the dead
b. : magic in general especially when directed toward the attainment of evil purposes : witchcraft , sorcery
2. : an instance of the practice of necromancy