1. (noun)apparition, phantom, phantasm, phantasma, fantasm, specter, spectre a ghostly appearingfigure "we were unprepared for the apparition that confronted us"
2. (noun)apparition, phantom, phantasm, phantasma, fantasm, shadow something existing in perception only "a ghostly apparition at midnight"
3. (adj)phantom something apparently sensed but having no physical reality "seemed to hear faint phantom bells"; "the amputee's illusion of a phantom limb"