The Collaborative International Dictionary of English v.0.48:

Spiritualization \Spir`it*u*al*i*za"tion\, n.
   The act of spiritualizing, or the state of being
   spiritualized.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spiritualization
    n 1: the act of making something spiritual; infusing it with
         spiritual content [syn: spiritualization,
         spiritualisation]