concealment
     n 1: the condition of being concealed or hidden [syn: {privacy},
          {privateness}, {secrecy}]
     2: a covering that serves to conceal or shelter something;
        "they crouched behind the screen"; "under cover of
        darkness" [syn: {screen}, {cover}, {covert}]
     3: the activity of keeping something secret [syn: {concealing},
         {hiding}]
Source: WordNet® 2.0