Apparition

Generally, an apparition is an instance of something's appearing, i.e. being seen. The term may refer to:

Supernatural

Apparitional experience, an anomalous, quasi-perceptual experience
Vision (spirituality), inspirational renderings, generally of a future state and/or of a mythical being
Marian apparition, in which the Virgin Mary is believed to have supernaturally appeared
Ghost, the disembodied spirit or soul of a deceased person
Doppelgänger, the ghostly double of a living person
Bilocation, the ability/instances in which an individual appears to be located in two distinct places at the same instant in time
Apparition (Harry Potter), a form of teleportation in the Harry Potter series

Apparition (Burning Inside album), an American album, released in 2001
Apparition (EP), a 2009 EP by The Contortionist
Apparition (The Legendary Pink Dots album), 1982 album by Anglo-Dutch group, by The Legendary Pink Dots
"Apparitions" (song), a 1998 song by Matthew Good Band
Apparitions (EP), an 2015 EP from Dutch black metal band Urfaust, released on Ván Records.
"The Apparition", a song from Iron Maiden's 1992 album Fear of the Dark

Apparition (company), a newly formed film distribution company in the U.S.
The Apparition, a 2012 American supernatural horror film
Apparition of Face and Fruit Dish on a Beach, a 1938 painting by Salvador Dalí
Apparitions (TV series), a 2008 BBC series about an exorcist
Phantom Girl (also known as Apparition Girl), a DC Comics superheroine
Apparitions, an orchestral work by György Ligeti
Apparitions, a 1936 ballet choreographed by Sir Frederick Ashton with music by Franz Liszt
Apparitions, creatures in Advanced Dungeons & Dragons