Wordnet 3.0
NOUN (2)
1. 
 the state of being secret; 
- Example: "you must respect the confidentiality of your client's communications"2. 
 discretion in keeping secret information; 
The Collaborative International Dictionary of English v.0.48:
confidentiality \confidentiality\ n.
   the state or attribute of being secret; privacy; as, you must
   respect the confidentiality of your client's communications.
   [WordNet 1.5 +PJC]
   2. discretion in keeping secret information.
      [WordNet 1.5]
WordNet (r) 3.0 (2006):
confidentiality
    n 1: the state of being secret; "you must respect the
         confidentiality of your client's communications"
    2: discretion in keeping secret information