WordNet (r) 3.0 (2006):

disassociation
    n 1: the state of being unconnected in memory or imagination; "I
         could not think of him in disassociation from his wife"
         [ant: association]
    2: a state in which some integrated part of a person's life
       becomes separated from the rest of the personality and
       functions independently [syn: dissociation,
       disassociation]