Apparition (noun)

1. A ghost or ghostly figure, especially one that suddenly appears.
2. An unexpected or unusual sight, especially one that appears suddenly or unexpectedly.

Origin:

From the latin word apparitio, from apparere meaning "to appear".

Examples:

1. Many people reported seeing an apparition of a woman in a white dress at the abandoned house.
2. The word "apparition" comes from the Latin word apparitio, from apparere meaning "to appear".
3. The apparition was gone as quickly as it appeared.
4. He saw an apparition of a man in a suit, standing in the corner of his room.
5. The apparition of the comet in the sky was a rare sight.