A ghost or ghostlike image of a person.
Ghost, Phantom, Spirit, Shadow, Presence, Vision, Hallucination, Shade.
"A headless apparition."
"An apparition, silhouetted against a bright torchlight coming from behind her."
A remarkable or unexpected appearance of someone or something.
Appearance, Manifestation, Materialization, Emergence, Visitation, Arrival, Advent.
"An apparition of the Virgin Mary."