n. 1. a visual illusion that results from the distortion of a perceived object of some kind. Often interpreted as threatening, apparitions may be associated with a neurological disorder, psychosis, or a toxic disorder, such as cocaine-induced psychosis. 2. refers to the perceived manifestation of a ghost or spirit. See also Gliosi image.. 3. the act of becoming visible to others.
APPARITION: "The person claimed to have seen an apparition after taking hallucinogenic drugs for recreational purposes. "