The Collaborative International Dictionary of English v.0.48:

Imminence \Im"mi*nence\, n. [Cf. F. imminence, L. imminentia,
   See Imminent.]
   1. The condition or quality of being imminent; a threatening,
      as of something about to happen. The imminence of any
      danger or distress. --Fuller.
      [1913 Webster]

   2. That which is imminent; impending evil or danger. "But
      dare all imminence." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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