The Collaborative International Dictionary of English v.0.48:

Disconnection \Dis`con*nec"tion\, n.
   The act of disconnecting, or state of being disconnected;
   separation; want of union.
   [1913 Webster]

         Nothing was therefore to be left in all the subordinate
         members but weakness, disconnection, and confusion.
                                                  --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disconnection
    n 1: state of being disconnected [syn: disjunction,
         disjuncture, disconnection, disconnectedness] [ant:
         connectedness, connection, link]
    2: an unbridgeable disparity (as from a failure of
       understanding); "he felt a gulf between himself and his
       former friends"; "there is a vast disconnect between public
       opinion and federal policy" [syn: gulf, disconnect,
       disconnection]
    3: the act of breaking a connection [syn: disconnection,
       disjunction]