spiritualismPronunciation: /ˈspɪrɪtʃʊəlɪz(ə)m, -tjʊəl-/Translate spiritualism | into Italian | into Spanish Definition of spiritualism noun [mass noun] 1a system of belief or religious practice based on supposed communication with the spirits of the dead, especially through mediums. 2 Philosophy the doctrine that the spirit exists as distinct from matter, or that spirit is the only reality. Derivatives spiritualist noun spiritualisticPronunciation: /-ˈlɪstɪk/ adjective spiritualism in other Oxford dictionaries Definition of spiritualism in the US English dictionary