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Definition of apparition : 1. An unexpected, wonderful, or preternatural appearance; a ghost; a specter; a phantom.
2. The act of becoming visible; appearance; visibility.
3. The first appearance of a star or other luminary after having been invisible or obscured; - opposed to occultation.
4. The thing appearing; a visible object; a form.

Synonyms:

trace, visitant, bogeyman, wraith, haunt, shadower, dark, beings, spook, darkness, bogey, phantasma, tail, fantasm, eidolon, revenant, supernatural, shade, bogle, vestige, tincture

emergence, inspiration, apotheosis, oracle, prophecy, issuance, discovery, gospel, revelation, appearance, epiphany, manifestation, revealment, disclosure, materialization, vision, coming, apocalypse, evidence

intangibility, impalpability, unreality, spectre, nullity, emptiness, nihility, cipher, insignificance, mirage, vacuity, nothingness, nonexistence, ethereality, zero, tenuousness, vacancy, immateriality

Dracula, werewolf, bogey man, chimera, succubus, illusion, myth, ghost, shadow, hobgoblin, specter, daemon, incubus, Frankenstein, bugaboo, nightmare, monster, phantasm, phantom, spirit, ogre, ghoul, terror, bugbear, horror, vampire

Usage examples:

• The child- apparition appeared beside its living sister one day while the sister was going from the yard into the house, and it followed her in. - "The Fairy-Faith in Celtic Countries", W. Y. Evans Wentz.
• When first seen, both it and the wapiti were beyond the reach of their rifles; and the hunters, surprised by such an unexpected apparition, had suddenly halted. - "Popular Adventure Tales", Mayne Reid.
• The citizens of Brussels contemplated with dismay the eccentric and threatening apparition. - "Project Gutenberg History of The Netherlands, 1555-1623, Complete", John Lothrop Motley.