降霊

Noun

 * 1) calling the spirits of the dead
 * 2) spiritualism

Usage notes
Of the two spellings and, the former implies more of a sense of summoning, and the latter more of a sense of exchange or communication.

Derived terms

 * : necromancy
 * : a séance

Verb

 * 1) to call, contact, or communicate with the spirits of the dead, to act as a medium