Definition from Wiktionary, the free dictionary
apparition (plural apparitions)
- An act of becoming visible; appearance; visibility.
- The thing appearing; a visible object; a form.
- Which apparition, it seems, was you. --Tatler.
- An unexpected, wonderful, or preternatural appearance; especially something such as a ghost or phantom.
- (astronomy) The first appearance of a star or other luminary after having been invisible or obscured;—opposed to occultation.
- (act of becoming visible): appearance
- (a preternatural appearance): vision
- See also Wikisaurus:ghost
Related terms 
act of becoming visible
unexpected, wonderful, or preternatural appearance
astronomy: the first appearance of a luminary after having been invisible or obscured
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apparition f (plural apparitions)