apparition

IPA: æpɝˈɪʃʌn

An act of becoming visible; appearance; visibility.
The thing appearing; a visible object; a form.
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.
(astronomy) 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.

Examples of "apparition" in Sentences

And another thing troubles me -- the apparition is English.
The visual aspect is not all of it—hence the misleading term apparition.
I used the word apparition because of the ghost-like visage that such a reflection creates.
These aren't pluralizations, which should be obvious from the examples. (e.g. the plural of apparition is apparitions.)
This strange apparition is no sooner left behind than two or three more, some smaller, some larger, come into sight; and so on all the way to Cairo.
It turns out she's read "The Anatomy of Ghosts," a tract Holdsworth wrote to debunk the claims of spiritualism, and she hopes he can convince her anxious son that the apparition was a delusion.
At other moments in the narrative, the haunting of the apparition is achieved solely through the powers of the voice — en route to the Villa Altieri, for example, a voice entirely lacking in any visually identifiable origin emanates as if from nowhere, at once betraying the uncanny presence of Vivaldi's ghostly companion as well as maintaining his invisibility: