Generally, an apparition is 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 the Harry Potter series, a person who is licensed to apparate can move from one place to another. See: Magic (Harry Potter)#Apparition
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