Generally, an apparition is the act or instance of appearing.

• In astronomy, certain sightings of celestial bodies are called apparitions.
• An apparition is an appearance to a human of a ghost, phantom, or other supernatural being such as God or Satan, or an appearance of a living person not physically present by ostensibly supernatural means. In colloquial speech, the word often refers simply to a ghost.
  • In Christianity, especially in Catholicism, a number of apparitions of the Virgin Mary are celebrated.
• "Apparitions" was a highly successful single by the Matthew Good Band, from their 1997 album Underdogs.
• In the Harry Potter series, a person who is licensed to apparate can move from one place to another. See: Magic (Harry Potter)#Apparition and Disapparition

Paranormal phenomena