apparition

noun5

1. •
   An act of becoming visible; appearance; visibility.

   • The apparition of Lawyer Clippurse occasioned much speculation in that portion of the world. — 1814
2. •
   An unexpected, wonderful, or preternatural appearance; especially, one by a ghost, phantom, or suchlike; the entity itself.

   • The region's economy is buoyed by tourism driven by past apparitions of the Virgin Mary.
   • The attic is said to be haunted by the ghostly apparition of a young girl who died there.
3. •
   The thing appearing; a visible object; a form.

   • […] which apparition, it seems, was you. — 1709
4. •
   The first appearance of a star or other luminary after having been invisible or obscured; opposed to occultation.
5. •
   A period of consecutive days or nights when a particular celestial body may be observed, beginning with the heliacal rising of the body and ending with its heliacal setting.