What is another word for hallucination?
Pronunciation: [hɐlˌuːsɪnˈe͡ɪʃən] (IPA) 
The word hallucination refers to a sensory experience that seems real but is not based on external reality. Synonyms for this word include delusion, illusion, mirage, phantasm, and apparition. Delusion refers to a false belief held despite evidence to the contrary and can be thought of as a more severe form of hallucination. Illusion is a perception that is not real, but can often be explained away by the illusion being caused by something in the environment, such as a trick of the light. Mirage refers specifically to an optical illusion caused by the refraction of light, often seen in the desert. Phantasm and apparition both refer to images seen that are not real and can be associated with ghosts, spirits, or other mystical beings.
