From The Collaborative International Dictionary of English v.0.48 :
Spiritism \Spir"it*ism\, n.
Spiritualsm.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
spiritism
n 1: concern with things of the spirit [syn: spirituality,
spiritualism, spiritism, otherworldliness] [ant:
worldliness]