The Collaborative International Dictionary of English v.0.48:

imminency \imminency\ n.
   the state of being imminent and liable to happen soon;
   imminence.

   Syn: imminence, impendence, impendency, forthcomingness.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

imminency
    n 1: the state of being imminent and liable to happen soon [syn:
         imminence, imminency, imminentness, impendence,
         impendency, forthcomingness]