The Collaborative International Dictionary of English v.0.48:

ambivalence \ambivalence\, ambivalency \ambivalency\n.
   1. mixed feelings or emotions; uncertainty or vacillation in
      making a choice.
      [WordNet 1.5 +PJC]

   2. (Psychol.) the simultaneous existence within a person of
      both positive and negative feelings toward another person
      or action, or toward an object (as of attraction and
      revulsion), resulting in internal conflict.
      [PJC]

WordNet (r) 3.0 (2006):

ambivalency
    n 1: mixed feelings or emotions [syn: ambivalence,
         ambivalency]