n. An apparition; a specter; a vision; an illusion or hallucination.n. An idea; a fancy; a fantastic notion.n. Specifically, in recent use, a phantom or apparition; the imagined appearance of a person, whether living or dead, in a place where his body is not at the same time.n. Synonyms Phantom, Apparition, etc. See ghost.n. In psychology: A memory-image.n. An image of imagination.