The Collaborative International Dictionary of English v.0.48:

Immediateness \Im*me"di*ate*ness\, n.
   The quality or relations of being immediate in manner, place,
   or time; exemption from second or interventing causes. --Bp.
   Hall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

immediateness
    n 1: the quickness of action or occurrence; "the immediacy of
         their response"; "the instancy of modern communication"
         [syn: immediacy, immediateness, instantaneousness,
         instancy]
    2: lack of an intervening or mediating agency; "the immediacy of
       television coverage" [syn: immediacy, immediateness]
       [ant: mediacy, mediateness]