the quality or state of being spiritual.-the doctrine, in opposition to the materialists, that all which exists is spirit, or soul -- that what is called the external world is either a succession of notions impressed on the mind by the deity, as maintained by berkeley, or else the mere educt of the mind itself, as taught by fichte.-a belief that departed spirits hold intercourse with mortals by means of physical phenomena, as by rappng, or during abnormal mental states, as in trances, or the like, commonly manifested through a person of special susceptibility, called a medium; spiritism; the doctrines and practices of spiritualists.