The Collaborative International Dictionary of English v.0.48:

Salience \Sa"li*ence\, n. [See Salient.]
   1. The quality or condition of being salient; a leaping; a
      springing forward; an assaulting.
      [1913 Webster]

   2. The quality or state of projecting, or being projected;
      projection; protrusion. --Sir W. Hamilton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

salience
    n 1: the state of being salient [syn: salience, saliency,
         strikingness]