apparition

n. ghost, spirit, manifestation

Generally, an apparition is the act or instance of appearing, including:a religious visionMarian apparitionany supernatural apparitional experience phantomphantasma paranormal appearance such as:a doppelgängersomeone experiencing bilocationApparition and disapparition in Harry Potter, a form of teleportation used in the Harry Potter novels
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Noun
1. a ghostly appearing figure; "we were unprepared for the apparition that confronted us"
(synonym) phantom, phantasm, phantasma, specter, spectre
(hypernym) spirit, disembodied spirit
(hyponym) Flying Dutchman
2. the appearance of a ghostlike figure; "I was recalled to the present by the apparition of a frightening specter"
(hypernym) appearance
3. something existing in perception only; "a ghostly apparition at midnight"
(synonym) phantom, phantasm, phantasma, shadow
(hypernym) illusion, semblance
(hyponym) unidentified flying object, UFO, flying saucer
4. an act of appearing or becoming visible unexpectedly; "natives were amazed at the apparition of this white stanger"
(hypernym) appearance
(derivation) appear, come along

n. appearance; vision, apparition; birth, emergence; occurrence; spook, wraith; Advent

(n.)
The thing appearing; a visible object; a form.
  

(n.)
The first appearance of a star or other luminary after having been invisible or obscured; -- opposed to occultation.
  

(n.)
The act of becoming visible; appearance; visibility.
  

(n.)
An unexpected, wonderful, or preternatural appearance; a ghost; a specter; a phantom.