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The Apparition
The Apparition by Gustave Moreau (c.1874-76)
Ghost photos
Photos of apparitions

Apparitions

Definition: Something that unexpectedly appears or becomes visible, apparently not by natural means.
Etymology: Middle English apparicioun, from Anglo-French aparicion, from Late Latin apparition-, apparitio appearance, from Latin apparēre.1

"Apparition" is a blanket term used to describe many different types of unexplained visual phenomena. Apparitions can be roughly divided into the following categories:

 

Resources:
1. http://www.merriam-webster.com/dictionary/apparition
2. Supernatural Glossary. 2008. Psychic Experiences. 27 March 2008. <http://www.psychic-experiences.com/glossary.php>
3. ParaNormal and Supernatural Definitions. [unknown]. ParaSkeptics. 27 March 2008. <http://www.wrexhamparaskeptics.4t.com/definitions.htm>
4. Glossary of Psi (Parapsychological) Terms (E-K). 2008. Parapsychological Association. 24 March 2008.<http://www.parapsych.org/glossary_e_k.html#g>
5. "doppelgänger." Encyclopædia Britannica. 2008. Encyclopædia Britannica Online. 10 May 2008 .