Evocation is the act of calling or summoning a spirit, demon, god or other supernatural agent, in the Western mystery tradition. Comparable practices exist in many religions and magical traditions and may employ the use of pharmakeia with and without uttered word formulas.
Read more about Evocation: Evocation in The Western Mystery Tradition, Texts and Language, Objectives of Conjuration, Religious Reactions, Conjuration in The Middle East, Contemporary References, Comparable Practices Elsewhere