apparition
//ˌæp.əˈrɪʃ.ən//
Noun
apparitionSingular
apparitionsPlural
1
A ghost or ghostlike image of a person, especially one that appears suddenly or unexpectedly.
She claimed to have seen an apparition in the old castle.
2
The act of appearing or becoming visible, especially something remarkable or unexpected.
The sudden apparition of the rainbow after the storm delighted everyone.