A ritual intended to bring a "lesser spirit" into your field of awareness, typically on either the Astral or Physical Plane. An evocation is more a command than a request, and brings the summoned entity to a location separate from the evoker's body.
The act of evoking or calling the spirit or spirits with whom we desire to communicate . Allan Kardec advised us to remain skeptic to what spirits actually answer our "call", meaning that they could be impostors trying to persuade us into doing wrong or simply playing with us. (See joking spirits)