WordNet (r) 3.0 (2006):

desynchronisation
    n 1: the relation that exists when things occur at unrelated
         times; "the stimulus produced a desynchronizing of the
         brain waves" [syn: asynchronism, asynchrony,
         desynchronization, desynchronisation,
         desynchronizing] [ant: synchroneity, synchronicity,
         synchronisation, synchronism, synchronization,
         synchronizing, synchrony]