apparition

noun

1. a ghostly appearing figure"we were unprepared for the apparition that confronted us"
2. the appearance of a ghostlike figure"I was recalled to the present by the apparition of a frightening specter"
3. something existing in perception only"a ghostly apparition at midnight"
4. an act of appearing or becoming visible unexpectedly"natives were amazed at the apparition of this white stranger"