GNU Collaborative International Dictionary of English

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1.       
   Spiritualism , n.
   The quality or state of being spiritual.
   1913 Webster
   (Physiol.) 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.
   1913 Webster
   A belief that departed spirits hold intercourse with mortals by means of physical phenomena, as by rapping, 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.
   1913 Webster
   What is called spiritualism should, I think, be called a mental species of materialism.
   R. H. Hutton.
   
   1913 Webster